Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d3a767c80fe1c60…

MALICIOUS

PDF

81.8 KB Created: 2021-01-05 21:01:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 276c74d9f2a03460889c5cae7314ba09 SHA-1: d13c2e216b3efd23deb9f81c0787f41c423872e0 SHA-256: 4d3a767c80fe1c60f70eb25fe3b4226f91e4c5703723dab5951de4cc71ca7d86
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to a known malicious redirector. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM indicate a strong intent to direct users to potentially harmful sites. The ML classifier and ClamAV detection further support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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/aws?utm_term=chopin+preludes+sheet+music+free In PDF document text
    • https://sidilatadafexu.weebly.com/uploads/1/3/1/1/131164021/bonoxulifa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455907/normal_5feb4e1ce254a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376358/normal_5fbd9792e9bae.pdfIn PDF document text
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/7360136.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487409/normal_5faa1b99280bf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500189/normal_5ff209a122495.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490539/normal_5ff3f171ca085.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/d867e6f8-e5a4-46d9-80e9-f53d70818835/metal_porch_roof_ideas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9940ea22-e2d5-42c6-81f7-d8297d781ec3/bogurepimibazavazive.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7779fb54-838e-4450-b3f1-d9e983a7ddbe/35th_wedding_anniversary_stone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c923859-e785-4273-8212-a0a668e1cf15/2001699866.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91df81c8-b42c-40a5-8f75-8d622df94f04/poc_bible_malayalam_buy_online.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4ED 5092 bytes
SHA-256: 66ee533f16295c43addbd5ab9827d7825670594c9ac45107e7d4cac2d5479fb4
font_01_sfnt_off0000e602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE602 2060 bytes
SHA-256: efda9760780256ac9b4358d36efb720cd52d232891923eea7fd69b9b485919bf
font_02_sfnt_off0000efab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAB 10752 bytes
SHA-256: 9493375fa774abccd9454d82cbc7dbe0562c2697d7a16dea2d61c3cd6f1edc40
font_03_sfnt_off00011459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11459 16184 bytes
SHA-256: 6932df4cb72b4efe2770651eeca670529029c4438adefa4b71cf057b6e4d930a
font_04_sfnt_off0001299b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1299B 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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