Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1c15e5e47fb03f7…

MALICIOUS

PDF

68.7 KB Created: 2021-04-09 21:20:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: c1fac607234bff4e3e1aa26cfe9846dd SHA-1: 73c53393b1b5db6a06140dc98d7d5498f21c7a2b SHA-256: f1c15e5e47fb03f7083ad64860a61709db8867143a67fbbcb6de508b0d7bf426
244 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure and a high ML classification. The document contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing campaign. While no scripts were extracted, the PDF structure and embedded links indicate an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://crophysi.ru/strik?utm_term=foscam+fi9900p+werkseinstellung In PDF document text
    • http://weridif.medianewsonline.com/informal_letter_format_in_english.pdfIn PDF document text
    • http://ig-copyrightviolation.com/kakerasipidege0vckb.pdfIn PDF document text
    • http://onsideball.info/techcrunch_extra_crunch_live9qjjy.pdfIn PDF document text
    • http://ruluzuzadol.mypressonline.com/gagof.pdfIn PDF document text
    • https://cdn.sqhk.co/zifiguwosu/he1jh9i/watch_with_friends_disney_plus.pdfIn PDF document text
    • https://cdn.sqhk.co/nazujovo/jgiifjb/download_holo_launcher_for_ics_apk.pdfIn PDF document text
    • http://ukranews.icu/cute_love_couple_cartoon_images8ryer.pdfIn PDF document text
    • https://cdn.sqhk.co/lexewagoz/Fihz7w8/nutukimevemimofus.pdfIn PDF document text
    • https://cdn.sqhk.co/dosazuleg/ha705id/cyber_hunter_lite_apk_download_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/rozesivotix/aU4BWig/web_for_instagramtm.pdfIn PDF document text
    • https://cdn.sqhk.co/jijatidos/jeQiumS/content-_transfer-_encoding_quoted-_printable_decode.pdfIn PDF document text
    • https://cdn.sqhk.co/tedubifo/jijbcPe/dabafugotinedakivate.pdfIn PDF document text
    • https://cdn.sqhk.co/nomazotesi/Jge17sn/racing_war_games_ps4_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cc652f91-b1ab-470c-b36f-46d838ef85b2.filesusr.com/ugd/fbccce_6d40432fc78c4e2ea737cecb6276e09b.pdf?index=trueIn PDF document text
    • https://d99c26cc-8c68-456d-a039-1a26994c8d26.filesusr.com/ugd/105a8c_303f833d214c496dac2c851019e52380.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rakabexozu/action_verbs_picture_dictionary.pdfIn PDF document text
    • https://cb6d8354-940b-4e05-9f1d-0150973ab277.filesusr.com/ugd/882da0_212c35b487d34061a1c88bf7e22d9794.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bisiku/notomepeduzob.pdfIn PDF document text
    • https://d3826037-6016-486c-99e9-dc41bc666644.filesusr.com/ugd/b81754_83cf43a993ab499b9aefd5232e9b6700.pdf?index=trueIn PDF document text
    • https://42190e62-4dca-482d-a077-ae7b222d7779.filesusr.com/ugd/b91392_4499399901664b64ba10ca5d857fcb0b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dozore/35119198880.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_off0000cf43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF43 5744 bytes
SHA-256: 8de339d7da639084d03e791e5562609352dd336527cb3d996b85205d83e10123
font_01_sfnt_off0000e2d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D8 10140 bytes
SHA-256: b95c4a1fdf26c6080c85a87f482859154dd054076956734c0a9424443b152dfc