Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b2d5c190b4734bb…

MALICIOUS

PDF

63.0 KB Created: 2020-11-18 06:09:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f73c93dd390a7b8eb135164b4a98bb55 SHA-1: a04780f6d543bb618b2ddce5abb82a5b5e087524 SHA-256: 1b2d5c190b4734bb8c4771e62b7cb98a94689fd2898b747d19e15a28a6d69a2c
214 Risk Score

Malware Insights

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

The PDF contains embedded links, with one critical heuristic identifying it as a redirector to known malicious infrastructure. The document body, though partially corrupted, contains text related to the malicious URL's query parameters. The presence of numerous external PDF links, many pointing to seemingly benign content, suggests a link farm or SEO poisoning tactic to mask the malicious redirector.

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/strik?utm_term=great+sausage+recipes+and+meat+curin In PDF document text
    • https://wazajodowefode.weebly.com/uploads/1/3/4/0/134017502/dixojonez.pdfIn PDF document text
    • https://dijumigomeruke.weebly.com/uploads/1/3/4/3/134309809/xibaw_juwajitupaf_fekatojokekuru.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/9b13d2bf-5a11-48f1-9922-773ce1f910d7/bugela.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04b05e91-cc31-49ca-a57e-cb535e341678/36399881066.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76d4cd3a-bf66-40f2-a6b1-ef5f8bd34217/civics_crossword_puzzle_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02f620b7-42b4-415a-88ab-d643222022aa/cartel_de_santa_bombos_y_tarolas_letra.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17aabf8f-a6c4-491c-8001-31885acd5330/ffxiv_alphascape_3.0_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b046d6b-ddc0-4fda-9b54-b6265ca269e8/fapid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6532771-ff54-443c-9e54-07aecdeb3603/mumazuzeziseru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96495892-3b72-4812-9e9f-b000bc8e5f91/its_your_birthday_we_are_going_to_party_like_its_your_birthday_lyrics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/525f7923-6909-4ed8-a809-6bdd9af2925c/ts_porn_hd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef282e80-e320-4e07-b4df-dc9a4754c4be/zipabafuzi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb5c3bef-6af5-45d0-8e9f-b5698d8d40b4/15355927392.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4aa3964-98c4-49d6-9d0e-3a068e9f004e/61618450600.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_off0000b90b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB90B 5392 bytes
SHA-256: 26d167063a8017658bff01d407de52f50ffdef8fe1a0673ba5d0a9bcee9494cd
font_01_sfnt_off0000cb50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB50 10608 bytes
SHA-256: b2dcbccae131fec6256a4acb14b53c5a978bf648597b15a5dc885d94ce042a60

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