Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8e3d8b070c556fd…

MALICIOUS

PDF

71.2 KB Created: 2021-03-16 17:24:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 730af40207fc45b02332b2cca3cad293 SHA-1: 995cb5700feaa6524a3bff1a6948df011b9ae9c8 SHA-256: d8e3d8b070c556fd6597d2010251a7c5510f1432a93ede916c42c910c64d8ad6
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 0.9992

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://midufefew.ru/wix?keyword=buck+knife+alaskan+guide PDF link annotation
    • https://gulojisaxedux.weebly.com/uploads/1/3/4/5/134598876/4323563.pdfIn PDF document text
    • https://jokikisiva.weebly.com/uploads/1/3/0/8/130873994/5bfda4d2.pdfIn PDF document text
    • https://cdn.sqhk.co/juwafajem/jhijTnv/tomorrows_weather_for_live_oak_ca.pdfIn PDF document text
    • https://cdn.sqhk.co/zojixemem/ziVhjib/riolis_cross_stitch_kits_amazon.pdfIn PDF document text
    • http://worilura.22web.org/9954128901.pdfIn PDF document text
    • https://cdn.sqhk.co/vizinifum/iJjcjjf/34679352488.pdfIn PDF document text
    • http://zitugaxusi.mygamesonline.org/affairscloud_banking_awareness_download.pdfIn PDF document text
    • http://pedaxofanor.mywebcommunity.org/dekuwawomit.pdfIn PDF document text
    • http://jekenufakewe.mypressonline.com/gsm_security_alarm_system_manuale_italiano.pdfIn PDF document text
    • http://waniwukudalutef.22web.org/bifekimemumimejelosogak.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2e907eb7-0cdb-46e5-a4de-ff0e34d1b96e.filesusr.com/ugd/7ea2c5_a58a4beb55b14e0da9c5ef6231464cca.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dobesogum/22306622511.pdfIn PDF document text
    • https://a52dd608-e7dd-4d50-8005-e0fd7a3896b4.filesusr.com/ugd/43d2fc_fca47dedddcd4160a4c5328407b8ee62.pdf?index=trueIn PDF document text
    • http://xawexixiwa.rf.gd/midexibawo.pdfIn PDF document text
    • https://69868269-04aa-4a0d-8379-1371762fd556.filesusr.com/ugd/d8beff_4fff1cff94ef4761ac9031703d9cafa9.pdf?index=trueIn PDF document text
    • https://d99d9bf7-a5e0-49f2-90ac-0d1bc881463d.filesusr.com/ugd/0182ef_ed479552f8e74d988de8ce89ef6a22aa.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tejuvonixag/sozukemojiruxuvotub.pdfIn PDF document text
    • https://s3.amazonaws.com/falevi/piriformis_muscle_injection_cost.pdfIn PDF document text
    • http://tenubitifane.rf.gd/manual_de_administracion_de_empresas_gratis.pdfIn PDF document text
    • https://s3.amazonaws.com/waxapoz/tewuzesuxakena.pdfIn PDF document text
    • https://s3.amazonaws.com/mokixetat/berserk_of_gluttony_manga_espaol.pdfIn PDF document text
    • https://e064a861-6c7b-46af-b67a-66be1f32d776.filesusr.com/ugd/ec3e4b_3639a7f1102547c0b3b0095b26f4aa80.pdf?index=trueIn PDF document text
    • http://dudenakapevawos.rf.gd/98821115307.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_off0000d7dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DD 5208 bytes
SHA-256: cdc9c7fc593f84558f98bd94c4a5834b6b4750b5098125cac2a40cd80d9b8ba5
font_01_sfnt_off0000e9b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B3 11000 bytes
SHA-256: 5d515c355b8f82695c42e1caf59392859b6621b44f4d06e73060e991dbb16843