Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8fb5e354bd91bbd…

MALICIOUS

PDF

78.7 KB Created: 2021-03-31 07:09:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 08a2ae21d8e38805491c170355665ad7 SHA-1: 19893cc345a439e94bfcc5270c13dbefac3bf731 SHA-256: c8fb5e354bd91bbd46b6bee47c12c57954d76f019bf2cc4cd1fe160dbe4d16ce
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://jottigo.ru/strik?utm_term=ariens+deluxe+28+sho+vs+honda PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366312/normal_6043fdbc07136.pdfIn PDF document text
    • https://tubufuximenijo.weebly.com/uploads/1/3/5/3/135304690/8068373.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366042/normal_6021a8ea02c93.pdfIn PDF document text
    • https://palukenibimel.weebly.com/uploads/1/3/4/4/134401756/nibodu_vizexel_wazimuzigafezi.pdfIn PDF document text
    • https://pimetukuke.weebly.com/uploads/1/3/4/0/134017259/1386151.pdfIn PDF document text
    • https://demujerifusa.weebly.com/uploads/1/3/1/4/131437649/tixuluwakuxove_wiratolubi_pefeze.pdfIn PDF document text
    • https://pafazemewo.weebly.com/uploads/1/3/4/5/134517711/140663293619163.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412887/normal_60356f4916962.pdfIn PDF document text
    • https://takadoturig.weebly.com/uploads/1/3/4/1/134108809/1171956.pdfIn PDF document text
    • https://begagezegitajaj.weebly.com/uploads/1/3/1/3/131398046/2439c4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nasitevu/merit_badge_requirements_citizenship_in_the_world.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/324fa9be-a435-41c0-9c69-9994b8014c66/jeletakufofovurilunana.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd0eeaf0-1ca2-4d49-b61c-665935a42e21/como_hacer_un_retrato_para_nios.pdfIn PDF document text
    • https://s3.amazonaws.com/pazerogasarinu/vezalanem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44f6b459-58a5-41a0-aa09-08a1b158fe93/tres_metros_sobre_el_cielo_subtitrat_in_romana_partea_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94e14c50-f30c-4ec0-b62e-9a75d25fc754/88210010904.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afe50547-f03e-48a7-aa21-915358103149/99806196076.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2586341-ef43-4a89-ba4e-4cb911eef569/45816447440.pdfIn PDF document text
    • https://s3.amazonaws.com/zebarufuridorur/how_to_lose_weight_with_organic_apple_cider_vinegar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94817d4c-5256-4509-bcc0-1c83e6d0ec51/how_to_set_up_baby_einstein_jumper.pdfIn PDF document text
    • https://s3.amazonaws.com/rizijubovapuk/poe_cyclone_leveling_guide.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_off0000f5d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D7 5356 bytes
SHA-256: 80dea4d19f292d6c982f172fffbddfefdeda6765a450c7a89ef973fcd0abce38
font_01_sfnt_off0001080b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080B 11124 bytes
SHA-256: 37f223ea225c647f784187e73bc31a6e7f35f59960ecfe68139fbb5ecbaa6e0a