Malicious PDF — malware analysis report

Static analysis result for SHA-256 629ca1edcb388cde…

MALICIOUS

PDF

77.2 KB Created: 2021-05-28 22:11:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 88e415422bb6659cabc1e71aff9c88d6 SHA-1: d23f231fff56415ddf99f2b4c20d29516abce84c SHA-256: 629ca1edcb388cded5d5dfa1375ab27ceac26c11cc72433f2f6f50fdf0a28ab9
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM', suggesting a tactic to drive traffic to potentially harmful websites or engage in phishing. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://lozipotod.ru/strik?utm_term=how+long+is+ait+for+31b+army
    • https://static.s123-cdn-static.com/uploads/4481999/normal_5fc87df536a82.pdf
    • https://static.s123-cdn-static.com/uploads/4416669/normal_5fefb2d5eff07.pdf
    • https://cdn-cms.f-static.net/uploads/4371025/normal_6047f7eb9f102.pdf
    • https://jaxebenub.weebly.com/uploads/1/3/4/2/134266064/b64d03548aa5484.pdf
    • https://cdn-cms.f-static.net/uploads/4386086/normal_601b2fdd9fd35.pdf
    • https://cdn-cms.f-static.net/uploads/4387229/normal_605254493a99d.pdf
    • https://tokoposejod.weebly.com/uploads/1/3/1/3/131380771/rimonagirubu.pdf
    • https://static.s123-cdn-static.com/uploads/4480904/normal_5fdd3b0dde788.pdf
    • https://static.s123-cdn-static.com/uploads/4421333/normal_5ffd256781b89.pdf
    • https://cdn-cms.f-static.net/uploads/4417653/normal_602b8d7f91029.pdf
    • https://cdn-cms.f-static.net/uploads/4368747/normal_5fd8c7b0982da.pdf
    • https://cdn-cms.f-static.net/uploads/4462985/normal_6022e2dcaa4ec.pdf
    • https://datezovog.weebly.com/uploads/1/3/0/7/130776229/ae29bd.pdf
    • https://cdn-cms.f-static.net/uploads/4422643/normal_605f6613735d3.pdf
    • https://static.s123-cdn-static.com/uploads/4469638/normal_5fde67555d437.pdf
    • https://lijoliwaxodoxi.weebly.com/uploads/1/3/1/3/131398144/8643429.pdf
    • https://static.s123-cdn-static.com/uploads/4453719/normal_5ff95ed699b54.pdf
    • https://static.s123-cdn-static.com/uploads/4485299/normal_5ff2b1b05c7a2.pdf
    • https://cdn-cms.f-static.net/uploads/4414849/normal_60417bccd142f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e9b8d686-7410-416d-befe-8c1fcb7bd4c8/51621017291.pdf
    • https://uploads.strikinglycdn.com/files/eda07124-90ca-4204-9d85-ab0b1711e542/diary_of_a_wimpy_kid_movie_4_trailer.pdf
    • https://uploads.strikinglycdn.com/files/3a092da6-d1bb-4f4e-b785-32df7906a3f0/health_and_safety_jobs_los_angeles.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efcc.bin
2ca57415d6c4e56095d794755725a1465bf61efbcbe9e56de8f0d9f0cb4c6fd3
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCC 5600 bytes
font_01_sfnt_off000102ea.bin
84c1ea7662ac0737571bf5e690836295a9633b34cec9991d321c4ecea9602edb
pdf-font-stream PDF embedded font (sfnt) at offset 0x102EA 10612 bytes