Malicious PDF — malware analysis report

Static analysis result for SHA-256 165014682b40ab94…

MALICIOUS

PDF

83.4 KB Created: 2021-03-29 18:28:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: cf1951331440ce6e834ff5a3eb9095ab SHA-1: f24be0d1d56ee1d7c30c239346f22386319918f8 SHA-256: 165014682b40ab941cf3d9b82ca91d1c9a5b6875f21cfa8997d3e5cd6d6d2974
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://xajibur.ru/wix?keyword=analysis+and+conclusions+answer+key PDF link annotation
    • http://detonic-hypertonie.website/network_defense_and_countermeasures_principles_and_practicesspu33.pdfIn PDF document text
    • https://cdn.sqhk.co/xefijumu/BjKKhi5/24560339932.pdfIn PDF document text
    • https://banafazag.weebly.com/uploads/1/3/4/3/134325205/fd66c.pdfIn PDF document text
    • https://cdn.sqhk.co/zoluxoni/idia4je/u_by_bb_t.pdfIn PDF document text
    • http://grantmedica.ru/77350303098nhc76.pdfIn PDF document text
    • https://kezobonuduwu.weebly.com/uploads/1/3/4/4/134457579/femudukiju.pdfIn PDF document text
    • http://lenudes.com/23925874396pnht6.pdfIn PDF document text
    • http://busibear.com/646202601479ld0o.pdfIn PDF document text
    • https://widosogepe.weebly.com/uploads/1/3/3/9/133986955/6abede3.pdfIn PDF document text
    • https://nefawuwezogixo.weebly.com/uploads/1/3/1/1/131163734/konemodusen.pdfIn PDF document text
    • https://mezobemubuzopos.weebly.com/uploads/1/3/3/9/133997151/vutetiwomolisam_kapepusobo_kesupinotulanid.pdfIn PDF document text
    • https://rimibike.weebly.com/uploads/1/3/4/6/134636102/3612999.pdfIn PDF document text
    • https://mijutadozas.weebly.com/uploads/1/3/4/5/134590660/3f808e9bb058ac.pdfIn PDF document text
    • https://gofolepoxi.weebly.com/uploads/1/3/4/8/134882907/kisifoxopop_tasotoponibo_mafasor_sagepepot.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://43081b45-6e48-4b43-b724-9328fda377ae.filesusr.com/ugd/26481d_e9fa6702bb1d40398f7c86a41e487b1e.pdf?index=trueIn PDF document text
    • https://d3826037-6016-486c-99e9-dc41bc666644.filesusr.com/ugd/b81754_c45432181ffc455bb5b633a468ea5a06.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rorives/what_is_the_role_of_medical_laboratory_science.pdfIn PDF document text
    • https://s3.amazonaws.com/zabejuvijolu/tropico_5_dlc_trophy_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/gorajikunobixi/automated_teller_machine_technology.pdfIn PDF document text
    • https://f8e303d0-f350-43d2-b7c3-f886ef13ec25.filesusr.com/ugd/1bb397_cf5abfc3ea134bff9695b56a3e248600.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f96b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96B 4980 bytes
SHA-256: 707a6edd364ad8a3efc4b32e5d91d910b7e22accf35072f27fed77d71927bb99
font_01_sfnt_off00010a67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A67 11108 bytes
SHA-256: bc10687abdb0679212c32eb8e76c36fead592c8d8adc3f1abe836be846af886c
font_02_sfnt_off00013060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13060 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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