Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e7f527f2293b768…

MALICIOUS

PDF

83.0 KB Created: 2021-02-25 23:54:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 207d82568d803a6176f32942ebcda4b9 SHA-1: ea7a5ae7197e88871f2d7526917c926a7e3a6858 SHA-256: 3e7f527f2293b768d9fe15df04c00520248e3321dafb2d9cef899e95896ea7f5
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains and flagged as malicious redirectors or part of a link farm. The document body, though heavily obfuscated, contains keywords related to repair manuals, suggesting a lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/award?keyword=washing+machine+lg+repair+manuals In PDF document text
    • https://felilediwifagid.weebly.com/uploads/1/3/1/4/131453780/witatowim.pdfIn PDF document text
    • http://pukoruserega.22web.org/badrinath_video_song_3gp.pdfIn PDF document text
    • https://nitipitu.weebly.com/uploads/1/3/0/7/130775162/rinimawo-buxipobi-radeputi-pagoxu.pdfIn PDF document text
    • https://sujoxiwu.weebly.com/uploads/1/3/4/8/134879933/mewosapon.pdfIn PDF document text
    • https://sepetumeba.weebly.com/uploads/1/3/4/6/134601334/baf1c466.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370785/normal_60194f9e07033.pdfIn PDF document text
    • http://dasaburaxad.22web.org/what_size_chain_do_i_need_for_a_stihl_ms170.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501770/normal_6029f2ae6da99.pdfIn PDF document text
    • https://noruwapawufibem.weebly.com/uploads/1/3/0/9/130969999/dazawinubodedu.pdfIn PDF document text
    • https://tukumexof.weebly.com/uploads/1/3/4/7/134721389/dekowosalenikod.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417675/normal_5fff7d895f662.pdfIn PDF document text
    • https://wobofosowipifir.weebly.com/uploads/1/3/0/7/130776138/4a3442db4a6006a.pdfIn PDF document text
    • https://posoxoniboje.weebly.com/uploads/1/3/4/7/134713430/bevakusosuwup.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bemuvubovewe.epizy.com/booster_pump_calculation.pdfIn PDF document text
    • https://s3.amazonaws.com/mutirexa/gta_3_cheats_codes_apk.pdfIn PDF document text
    • http://ninonasoligu.rf.gd/noxiradovabexarivolafak.pdfIn PDF document text
    • https://s3.amazonaws.com/lakujusitejojet/brother_printer_l2520d_driver.pdfIn PDF document text
    • https://s3.amazonaws.com/nitatotol/1086287496.pdfIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001094d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1094D 5360 bytes
SHA-256: 3f33ef550bf02027db33b5f1dc3662996529597546e31346bfdb035dabd43090
font_01_sfnt_off00011b6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B6F 10240 bytes
SHA-256: 6d671de03e1c3f101038d16d5ffba466317d98de38a9d969e53735d6687dea38

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