Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d8939fb6ef926a6…

MALICIOUS

PDF

78.4 KB Created: 2021-05-23 23:53:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: d3650a0e492a95bc61cc23dc79b27d99 SHA-1: 57087145a1aa2b91b2903ebbcfd422a50b491555 SHA-256: 4d8939fb6ef926a6bfb905e5cc4dec3ae776d9dac444504869ef8dd306b3d4d6
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a link farm with numerous external URLs, many of which are hosted on disposable domains or are part of a link farm designed to appear as search results. The primary malicious URL, 'https://xezojetit.ru/strik?utm_term=dell+latitude+e7270+bios+settings', is presented as a lure for BIOS settings, indicating a phishing or scam attempt. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xezojetit.ru/strik?utm_term=dell+latitude+e7270+bios+settings PDF link annotation
    • https://xajavixakopus.weebly.com/uploads/1/3/4/8/134898113/zibel.pdfIn PDF document text
    • https://wuguruxozoza.weebly.com/uploads/1/3/4/0/134040539/vijafaxobaxujeju.pdfIn PDF document text
    • https://rijamukomebojo.weebly.com/uploads/1/3/4/5/134585881/9536989.pdfIn PDF document text
    • https://luzepazokiguj.weebly.com/uploads/1/3/4/3/134396814/megamalukewowumujix.pdfIn PDF document text
    • https://milevewon.weebly.com/uploads/1/3/4/0/134041257/8f7ef04083c5c.pdfIn PDF document text
    • https://gepidoduxaw.weebly.com/uploads/1/3/5/3/135324144/nudapuxodase.pdfIn PDF document text
    • https://sodujamewo.weebly.com/uploads/1/3/4/7/134750465/bamekozo_gebexikalofonar.pdfIn PDF document text
    • https://bilokomomaxin.weebly.com/uploads/1/3/5/3/135397692/bunasakaborasimupit.pdfIn PDF document text
    • https://betirowi.weebly.com/uploads/1/3/4/6/134661799/dinuzejebapalaxifaj.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/mivokozibu/archbishop_mccarthy_school_uniforms.pdfIn PDF document text
    • https://s3.amazonaws.com/libowebujakux/nelson_math_textbook_grade_8.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/084b1b42-676a-4963-8c0b-bf1c807bf8a3/the_best_quotes_ever_about_success.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f49d1897-8104-460a-ab13-1932f63922c7/virtual_family_feud_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/640fba2a-ac40-4170-b9bd-143b24210ab7/can_you_be_a_drill_sergeant_as_an_e5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05ca5425-d964-4fea-a07f-cc9801658f1c/penuvagikal.pdfIn PDF document text
    • https://s3.amazonaws.com/jusagi/john_deere_1023e_tractor_backhoe_attachment.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f3ece24-0fd8-451b-a0ed-e7b17162ff6a/98332322816.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1abc160-2686-4ed3-afb8-27ced8dcb6c8/narrative_writing_prompts_for_middle_school.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_off0000eba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA4 5388 bytes
SHA-256: 7deccfd32ce9c23a2545d77874438db2298ed97d3020a340b6b605e3bc733386
font_01_sfnt_off0000fe16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE16 14656 bytes
SHA-256: ff029f524d86948970f13964acad15d31ecc79e18dcf28e69aa3f217f578da1c

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