Malicious PDF — malware analysis report

Static analysis result for SHA-256 42b2d620fc3d1272…

MALICIOUS

PDF

78.7 KB Created: 2021-03-21 22:07:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 806cf97fa131a64a32a28e7e62717c9c SHA-1: 5ed399103a1c22a1f867d87d0776ebe7e434aefe SHA-256: 42b2d620fc3d1272775b39777dfaddfa5d8b0b7be3bb1fc7ce320d91356523f4
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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.
  • 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://xezojetit.ru/award?keyword=position+of+adverbs+of+manner+pdf PDF link annotation
    • https://cdn.sqhk.co/xuruwivagezu/jfN27p1/zatubof.pdfIn PDF document text
    • https://cdn.sqhk.co/ferorigife/jbmhcIv/bugsy_below_deck_twitter.pdfIn PDF document text
    • https://pogipusuzifu.weebly.com/uploads/1/3/4/8/134869227/jojojorawarog_zigoroxin_vugudemagifi_kumajujewokovi.pdfIn PDF document text
    • http://gavixed.iblogger.org/verizon_fios_router_red_globe_after_power_outage.pdfIn PDF document text
    • https://zepifuvuxetota.weebly.com/uploads/1/3/6/0/136095774/kugitofiwifop.pdfIn PDF document text
    • https://tuwazumabokanif.weebly.com/uploads/1/3/4/6/134611666/zemun.pdfIn PDF document text
    • https://bebejumupetokox.weebly.com/uploads/1/3/4/5/134513190/150ba6a845a7b.pdfIn PDF document text
    • http://busawilapuguzas.iblogger.org/16023121628.pdfIn PDF document text
    • https://cdn.sqhk.co/guranotup/Ehb3tgj/startup_the_board_game_geek.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusemob/jathiji/tigesavezodavawazezodoju.pdfIn PDF document text
    • https://fibutoledul.weebly.com/uploads/1/3/2/7/132741024/labij-gapidedizo-boduwazawagebe.pdfIn PDF document text
    • http://revujutipisan.22web.org/ultra_balloon_game.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wowadowir.epizy.com/ronusu.pdfIn PDF document text
    • https://72cdfa97-b5fe-44cc-9aa9-3142b5aa642a.filesusr.com/ugd/ee32c9_cec59347abcd4ec8a774c9d49ea811ff.pdf?index=trueIn PDF document text
    • http://xakosafejel.epizy.com/filematixudun.pdfIn PDF document text
    • https://4454cc88-256b-48ad-9013-c0414c72072d.filesusr.com/ugd/67e251_d01bab024d93410f8478eb7233b9d6c5.pdf?index=trueIn PDF document text
    • http://kozifina.epizy.com/lujitukuzusabozobub.pdfIn PDF document text
    • https://30b7a97f-6117-4fff-8876-4b3c2220b6c6.filesusr.com/ugd/15cd4d_ebe284542006408e8eb685054ba1f239.pdf?index=trueIn PDF document text
    • https://c4e42e93-254c-4ba8-b495-737f84002742.filesusr.com/ugd/ddb60a_a90b5eb3c7ef402493d5a8ff478d06b3.pdf?index=trueIn PDF document text
    • https://5c09c65f-4728-49e3-9562-8692e696fc4f.filesusr.com/ugd/32acb1_275ca899d23d4e3ea3f51f1ad5dd4fc9.pdf?index=trueIn PDF document text
    • http://redusaboj.epizy.com/kundi_much_song_video.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_off0000f6bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BF 5356 bytes
SHA-256: 6a207cd680c2fe284091c11be94254cc0ac3e0e2a080fabf2dca19b75871935e
font_01_sfnt_off000108e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E3 10848 bytes
SHA-256: 1dcd6abbe9c37358fc3e505a42e8af0734c405546e5d29a6c270174ab055bf3c

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