Malicious PDF — malware analysis report

Static analysis result for SHA-256 c601935a3778ad65…

MALICIOUS

PDF

66.3 KB Created: 2020-12-18 06:40:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 5661decf08b3d29f4dd7b3ebbcf95dfb SHA-1: 9bf1ddc42d3e3eec0806f36662352c099d8ec5d7 SHA-256: c601935a3778ad65d2cd196e00d207342cea74c666388e2a8199e9571e38758f
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, with one critical heuristic firing indicating it leads to known malicious redirector infrastructure. Another critical heuristic identified it as a PDF link farm, suggesting a phishing or SEO manipulation tactic. The ML classifier and ClamAV also flagged this PDF as malicious, supporting a phishing or trojan classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://gettraff.ru/123?utm_term=four+types+of+sentences+examples In PDF document text
    • https://cdn-cms.f-static.net/uploads/4381978/normal_5f92b4ce62e00.pdfIn PDF document text
    • https://wizitizisib.weebly.com/uploads/1/3/4/3/134361222/zofilaxagosudik.pdfIn PDF document text
    • https://fodezamu.weebly.com/uploads/1/3/1/4/131407453/9375281.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/litunux/sqlite_android_tutorial_c.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d12af8e2-3d29-4662-9667-c7799f78235e/2018_rav4_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82919ff9-b282-4e11-9d46-07b6034d5e67/47330791789.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b29a1406-6230-452b-9d66-6eaedecd8802/52195231626.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/071c1626-3e7d-4803-b9c6-6ff12bbb18c7/2626598086.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2846b11-72aa-4eeb-9822-7b9b0b7f1bf5/riddle_me_this_penny_has_5_children_answer.pdfIn PDF document text
    • https://s3.amazonaws.com/dalava/energia_hidrostatica.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fef26aa-0b27-4095-bbea-da19a5296cf3/the_birth_and_death_of_meaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0a02f98-e28a-452f-bc66-4793b9c96962/how_to_apply_for_hardship_license_in_mississippi.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_off0000c6ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6EE 5288 bytes
SHA-256: 65f6b346bb47186b588c1f751a951f9f791152c033f3b14560ee672b65399006
font_01_sfnt_off0000d8eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8EB 10564 bytes
SHA-256: c473ea9ec70c4f8e50a8eaff93f5b8688dc9fd97fbc7e1ef6609e2cfe1b5112a

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