Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc6d7c233c6910c8…

MALICIOUS

PDF

68.3 KB Created: 2021-01-06 03:02:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: d75bc9e787f07d730330ede549c660e6 SHA-1: 90aff098ca619bf5e6bbae51384c0474e06b9e62 SHA-256: dc6d7c233c6910c8d5432450db371c4c1eb1f59b898f8ebc256a2016bc42a868
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. One of the primary URLs, 'https://trafficel.ru/aws?utm_term=factor+tree+worksheets+for+4th+grade', suggests a lure related to educational content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • 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://trafficel.ru/aws?utm_term=factor+tree+worksheets+for+4th+grade PDF link annotation
    • https://ranalugepileli.weebly.com/uploads/1/3/4/7/134735155/gapoxuju_dagunum_duseduratilojad.pdfIn PDF document text
    • https://cdn.sqhk.co/noruwotil/WjftOic/14241080451.pdfIn PDF document text
    • https://cdn.sqhk.co/wajidafix/gfujfhf/98604714275.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f119610-7856-4ff5-86bf-a96752e6a0b8/nubasomovopegexukigilivo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bf57d60-59e2-4039-8970-9a911578ba57/52831326300.pdfIn PDF document text
    • https://s3.amazonaws.com/taguxif/87164595010.pdfIn PDF document text
    • https://s3.amazonaws.com/fomaralunex/socratic_seminar_topics_for_oedipus_rex_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0816e30-97d1-4b89-9260-b656021559f9/wererejakenigurewemaro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e91dfe47-e5e2-4833-bb27-93cc7abe4f6e/zigarifupekewebotumuti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e47b525-c03e-44b3-99af-cdea47f93d22/the_devil_s_arithmetic_free.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_off0000ce49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE49 5448 bytes
SHA-256: 237d65741e78f93fbf2c28976920ccb8b3ff726ca4bc7bc2aea9cf358f7b6ced
font_01_sfnt_off0000e0e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E7 10480 bytes
SHA-256: ebcff649f98cb953d38065005bb190d1a45cd04b2c2730144b8111296097e403

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