Malicious PDF — malware analysis report

Static analysis result for SHA-256 78623d5bbd2668fa…

MALICIOUS

PDF

78.8 KB Created: 2021-03-23 21:46:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 921aa4aea409ee942b6b0249f35a96f4 SHA-1: 960c3b125cecc4ab1e67d958a9838dee2d488fb5 SHA-256: 78623d5bbd2668faec7d9603cde2825cdfc892a6a4aaea14b279b0bd6f4233eb
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a significant number of external links, with many pointing to disposable hosting, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The embedded URLs and the PDF structure itself are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/wix?keyword=leah+itsines+chicken+gyros PDF link annotation
    • http://fesavuxofogegil.iblogger.org/88897556139.pdfIn PDF document text
    • https://temavemata.weebly.com/uploads/1/3/4/6/134611183/8213199.pdfIn PDF document text
    • https://lawejuja.weebly.com/uploads/1/3/0/7/130740077/lofupazugilezizanita.pdfIn PDF document text
    • http://mogurasubep.22web.org/memirototurelotuji.pdfIn PDF document text
    • https://zofazozudu.weebly.com/uploads/1/3/0/7/130739697/jituxijozan-beruj.pdfIn PDF document text
    • https://tawozajoruje.weebly.com/uploads/1/3/4/3/134314125/4852732.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lewiwoladizot.rf.gd/can_you_add_teeth_to_a_partial_denture.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ebdf923-b5ee-4f3b-b4f0-f925ab6c49ad/what_is_the_purpose_of_associated_press.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7858a01-988e-4353-bfc8-361b1a8759a1/zijewufudama.pdfIn PDF document text
    • http://dipijiz.epizy.com/boeing_737-_300_maintenance_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/sepovutapakogaf/beveiligde_toch_afdrukken.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20afbb1c-ec20-4c7b-bcf1-656127cd6793/levonu.pdfIn PDF document text
    • https://s3.amazonaws.com/doxifuba/76104532852.pdfIn PDF document text
    • http://xesovukefezusag.rf.gd/brunswick_east_restaurants_dining_guide.pdfIn PDF document text
    • http://komoxam.rf.gd/7254417068.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9eabef95-1650-4629-a941-464c86fa1efe/38238544318.pdfIn PDF document text
    • http://vebadanu.rf.gd/movemu.pdfIn PDF document text
    • https://s3.amazonaws.com/tonemakopinibem/smart_but_scattered_young_adults.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/unique_lady_chinese_drama_eng_sub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0b0d0d9-6181-44fa-98b3-70565415f2a7/vikepodimirowuvixitiwat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb579bd7-3595-4a64-acb8-67d0055c82f3/jeppesen_private_pilot_141_syllabus.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_off0000f437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF437 5136 bytes
SHA-256: 5effe672283779c55fb6d678b8b6c6bd5d863d7c48fdd68f83e2e4a19ccd1552
font_01_sfnt_off000105bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BC 11400 bytes
SHA-256: 5c5a51f6bec412595865b6745518caf8cefbde798430ccead07a364528c6133a