Malicious PDF — malware analysis report

Static analysis result for SHA-256 28dff758cd8760fe…

MALICIOUS

PDF

101.8 KB Created: 2021-03-18 12:52:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: b763691c7456a4ebd01b8911b3f88ead SHA-1: 6168c91f8d37fc6fa2f2ca784dcd2fa40fa8dfae SHA-256: 28dff758cd8760fedf0df45a39e8728f6832947c29c282fd9c29ad1929ead0d1
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed for SEO manipulation or phishing. The presence of a 'download button' heuristic further supports a lure-based attack. ClamAV detection and ML classification confirm the malicious nature of the file, likely serving as a dropper or redirector to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://botokaw.ru/123?utm_term=cant++netflix+app+on+ipad+2 PDF link annotation
    • http://nebemor.mywebcommunity.org/72918675341.pdfIn PDF document text
    • http://vulgargirls.fun/93001185378nf4zf.pdfIn PDF document text
    • http://workshop-fb.ru/how_to_use_wd_my_passport_wireless_prowb65e.pdfIn PDF document text
    • http://instgrmmverifiedbadge.com/tusemolirumbkya.pdfIn PDF document text
    • https://cdn.sqhk.co/japanakoga/jsieIjb/vocaloid_synthesizer_free.pdfIn PDF document text
    • https://sexuviruzimi.weebly.com/uploads/1/3/2/8/132814305/6bd93069652c54.pdfIn PDF document text
    • http://zijixiteluwek.scienceontheweb.net/83710871800.pdfIn PDF document text
    • https://cdn.sqhk.co/zifeduwa/c5hiieX/android_police_motorbike_simulator_3d.pdfIn PDF document text
    • https://fulotetaputu.weebly.com/uploads/1/3/2/7/132740707/3332668.pdfIn PDF document text
    • https://cdn.sqhk.co/tememagitapo/jdhiihN/25123644875.pdfIn PDF document text
    • https://cdn.sqhk.co/zadoweferoxe/TTidlhj/whatsapp_messenger_download_for_pc_windows_xp.pdfIn PDF document text
    • https://votumojelobi.weebly.com/uploads/1/3/4/8/134848055/retezo.pdfIn PDF document text
    • http://keniworu.mywebcommunity.org/titijopimixop.pdfIn PDF document text
    • https://cdn.sqhk.co/xonepogafix/idiizFD/30076248667.pdfIn PDF document text
    • http://garderob-podolsk.ru/huck_finn_chapter_25_summary_shmoop8dyyu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://6c9aa500-f8d9-42a6-b8a4-5b3c562bbfc3.filesusr.com/ugd/543886_a1f62cd4065b44e1a0a9c5882d658e39.pdf?index=trueIn PDF document text
    • https://58fabbca-0322-4868-a582-948aa19840f9.filesusr.com/ugd/93748c_dac10e5f0f6a43338e51963361978ae4.pdf?index=trueIn PDF document text
    • https://2ddedb0e-b7b0-41c9-a8bc-c018bd0e6e4c.filesusr.com/ugd/70094d_432b88f1308f4034b2e62803f85ca878.pdf?index=trueIn PDF document text
    • https://aeedc83c-a41d-4179-9d48-e770e4c4cd47.filesusr.com/ugd/e010a7_14e111d8904d4431bf1024d665ee4378.pdf?index=trueIn PDF document text
    • https://e2604e0b-f95a-4acb-b53f-a7db3827b2a1.filesusr.com/ugd/225520_da89df4b8462451ea4dc99074a2cbe61.pdf?index=trueIn PDF document text
    • https://a5fc3680-5c08-4cda-bd6c-abaa3bdf25bc.filesusr.com/ugd/ea5d7b_a6efc57c6b514386b6acbab4e75d6f0d.pdf?index=trueIn PDF document text
    • https://ac734925-007a-49fa-9a6b-2340142042ec.filesusr.com/ugd/ea78e0_9eb49e67bb6e4d9c96eadfe2796abb90.pdf?index=trueIn PDF document text
    • https://35479656-6a94-44d6-ac55-da507c14a2ae.filesusr.com/ugd/d68318_a8c99fad32e040369c23cc2b1b9c508e.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12465 4772 bytes
SHA-256: 5c3b7a7fd23a6af63c9690d4c9e3fc747f58b34411350fe38eb909be88bc407b
font_01_sfnt_off000134b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134B4 1800 bytes
SHA-256: daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e
font_02_sfnt_off00013d42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D42 11508 bytes
SHA-256: 88cc15030748fa737fa086fb409b260d7c5046eaff2c41ff502ed5939529d83f
font_03_sfnt_off0001639d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1639D 16296 bytes
SHA-256: 5a6f1b4535b5c477309ec86988cd99a43785e3d93be7109d3e9d713e1b840b23
font_04_sfnt_off00017918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17918 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176