Malicious PDF — malware analysis report

Static analysis result for SHA-256 b37c202f0a45ace4…

MALICIOUS

PDF

72.4 KB Created: 2020-11-18 21:39:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: daffafd146c5d13a3023fe0336d662e9 SHA-1: 73b333961edb924d9838285502be0ebc1f30b5aa SHA-256: b37c202f0a45ace45504e494a4a2770f3ffa2a31e9a77d60728680a1cb06bba5
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many pointing to disposable domains and Weebly-hosted PDFs, indicating a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=what+is+critical+process+parameter In PDF document text
    • https://rokumetusemep.weebly.com/uploads/1/3/4/3/134382705/kopovopugawazoka.pdfIn PDF document text
    • https://nosavarugogitov.weebly.com/uploads/1/3/4/4/134488680/wogiwata-bawuzad-kupunimosuv.pdfIn PDF document text
    • https://donodofi.weebly.com/uploads/1/3/1/8/131856097/9adac6835a97805.pdfIn PDF document text
    • https://xesapidad.weebly.com/uploads/1/3/4/3/134346602/2c4ef.pdfIn PDF document text
    • https://lewixixidofuj.weebly.com/uploads/1/3/4/3/134393564/60aa0fe83.pdfIn PDF document text
    • https://jomobezeg.weebly.com/uploads/1/3/4/6/134606819/dipoludu.pdfIn PDF document text
    • https://vavemome.weebly.com/uploads/1/3/4/6/134609594/xoronogusi.pdfIn PDF document text
    • https://naletonuve.weebly.com/uploads/1/3/4/3/134381452/1457735.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444636/normal_5fa5125a55a3f.pdfIn PDF document text
    • https://meverofukibax.weebly.com/uploads/1/3/4/6/134620555/a6a68521.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/d5372c08-f867-4fac-8e1f-161fbd201780/hesi_a2_study_guide_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3efa94b8-6667-4089-99dc-36d7fa619422/85711993641.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bb2a408-4ce6-4d9d-9c62-2d6499de1023/xebumup.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD262 4868 bytes
SHA-256: 005e5d223aaa4a66015a252d5beb61c2402490dbe99b71b91390e9f4cc7a72ad
font_01_sfnt_off0000e2ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EE 10452 bytes
SHA-256: e5c050169d2f05ec6558fc9febe5016908eaf444785e311c02e0674fc14be7b5
font_02_sfnt_off00010677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10677 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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