Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a40b57f22594f0a…

MALICIOUS

PDF

65.7 KB Created: 2020-12-23 02:23:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 78884601088258d39c07b44d244ee790 SHA-1: 58f1a2d6c31b86b97e940afce0de9356230bb61a SHA-256: 0a40b57f22594f0adbf6fec73de5e1a603810cca6c24ee09257eedec77becaca
214 Risk Score

Malware Insights

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

The PDF contains a link farm and redirects to a known malicious URL, indicating a phishing or malware distribution attempt. The presence of numerous external PDF links, including one to a suspicious domain, suggests an effort to obscure the final malicious destination. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://traffine.ru/123?utm_term=taco+bell+crunchwrap+supreme+nutrition+values In PDF document text
    • https://xilevaxe.weebly.com/uploads/1/3/4/3/134391777/bf530f3e0d6ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374199/normal_5faa242930134.pdfIn PDF document text
    • https://majuzifulanapu.weebly.com/uploads/1/3/4/8/134887757/watawedivano_sunebumim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424632/normal_5fb76a0e5a00c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379973/normal_5f9bee732a362.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372085/normal_5fcf4921a40f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368250/normal_5f8fd53dd395e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383801/normal_5fa53f58cf3c1.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/mexavofezoxi/easy_piano_songs_chords.pdfIn PDF document text
    • https://s3.amazonaws.com/geradi/my_hero_academia_ep_46.pdfIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/86980163592.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da2a528f-05e8-4eb4-a9de-b109ac0d5433/navy_mentor_program.pdfIn PDF document text
    • https://s3.amazonaws.com/libeganot/umuc_plagiarism_test_answers.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_off0000c3ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3AC 5412 bytes
SHA-256: fccdd86e20728c41ad7d471bed473918a6f3e20435319420feeef64206661d5e
font_01_sfnt_off0000d5fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5FA 10436 bytes
SHA-256: 58a02307bcd764401723a3297c1e85089745dae79c3ae818ff44da0f3a28aee1

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