Malicious PDF — malware analysis report

Static analysis result for SHA-256 d31f0787c2cf3426…

MALICIOUS

PDF

74.8 KB Created: 2020-11-21 21:53:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 54bdd5aae89025744f0e5ea640bd20c2 SHA-1: 187d812e07d3a5de653ecd13903d9b97db46d555 SHA-256: d31f0787c2cf3426c683ab457971f4976f92df5054abcd89abd44f285ccca258
222 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier. It contains numerous links to external websites, including a known malicious redirector at 'traffmen.ru', suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, appears to be a lure related to job interview questions, aligning with the 'SE_URGENCY_LURE' heuristic.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://traffmen.ru/123?utm_term=procurement+specialist+job+interview+questions+and+answers+pdf In PDF document text
    • https://zekuwatifakaxi.weebly.com/uploads/1/3/2/8/132815855/nagusifivugubop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369663/normal_5f880daf9721d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417221/normal_5fb5e1511fb5e.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/ragejufa/oak_grove_plantation_ga.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/al_quran_word_by_word_translation.pdfIn PDF document text
    • https://s3.amazonaws.com/vazisi/aladdin_games_free_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ac0a3ef-fb69-441d-87b5-e63000850bde/walozadafuzup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ed7053d-a5f3-4ffd-949a-c63df91ba7cf/wordly_wise_3000_book_8_lesson_5e_an.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a965cfbb-aa66-48ac-aba1-e91ac71eab60/roadmaster_vitamaster_pro_treadmill_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c33176f7-9ebd-401f-a9c5-a615a42f0ccb/important_dates_in_peru_history.pdfIn PDF document text
    • https://s3.amazonaws.com/gumegulaxi/samakisabadiba.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_off0000e40a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE40A 5796 bytes
SHA-256: c0e0de17817bcdb63ba0ea062424b8b4da4db76bc464b136a2972d2af4488299
font_01_sfnt_off0000f7be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BE 11204 bytes
SHA-256: b91d1563317c0a898ca4dc0f9bf0d9300371c0ae74de338929087774a47a4680

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