Malicious PDF — malware analysis report

Static analysis result for SHA-256 012299608da2c5db…

MALICIOUS

PDF

77.9 KB Created: 2021-03-18 16:18:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 9bc9d90f0b403f0acf8a9c872d097cff SHA-1: b76336edb40834da3b08ae37cb75a4fd4887388f SHA-256: 012299608da2c5dbbbb3c11dc1717a59a46b400a17e5de8d59f2d6b4b918e2f5
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, indicating a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://dugedepap.ru/123?utm_term=top+10+adventure+games+for+android+mobile PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4389104/normal_6037b1746ac50.pdfIn PDF document text
    • http://magazinrf.xyz/dyson_ball_toy_vacuum_videofhyfv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415081/normal_604174ddc197a.pdfIn PDF document text
    • http://fruits-summer.fun/how_much_does_it_cost_to_replace_the_screen_on_a_galaxy_s52eaq6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486359/normal_604dcc086fd78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419236/normal_6026342668cd9.pdfIn PDF document text
    • http://sdek-24.cc/11659005987xa1qy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471704/normal_60149db11ad49.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/4ae8eaaa-4fbd-40e8-b72b-21faea1e9356/89356021857.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3196d53-993e-49f5-9062-58c53bf814b6/how_to_reset_clock_on_oster_microwave.pdfIn PDF document text
    • https://5457524e-bace-410a-9ce7-c8d8bc0eedea.filesusr.com/ugd/f0ffd0_3ece2c414409470e9185f05886e4a5b5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/46ce51c3-f66d-48df-85f5-14675b4ee6bf/deluvomidirigafopixanip.pdfIn PDF document text
    • https://5f384421-c3d0-4b4c-85a6-d3745974446f.filesusr.com/ugd/40006b_4a13186ac00842b693c2ea6c8f93d42a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7edb3c3-3461-4cf1-a6b8-3403658f590c/76461268196.pdfIn PDF document text
    • https://3ecc1590-a62a-4317-9845-4395e9141a58.filesusr.com/ugd/237bf7_072399d5be594392b3571d1e866b51da.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/212cd00a-04f8-49ad-9891-5510712ada93/30236665901.pdfIn PDF document text
    • https://e5447efa-8854-4d04-834e-f0bbd7438c8b.filesusr.com/ugd/ac612b_596ea5519b044a65a8abb8fcd6199461.pdf?index=trueIn PDF document text
    • https://7ed754b6-a209-4558-9281-0032c7ee8ade.filesusr.com/ugd/4329d7_400ab843e62140fe884e82352c34d83c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/04513621-fc8f-4dae-bc8f-50dd2c5fb68e/8910053904.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea9277a3-e14f-479e-a0bc-2220b8e90263/sodastream_dishwasher_safe_bottles_australia.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_off0000f11e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11E 5704 bytes
SHA-256: 6addf80229b0be8919e4225ab5238ec6d5aa310e528aaf488a01540cc47b0b50
font_01_sfnt_off0001047f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1047F 11004 bytes
SHA-256: 1085d74f74913bf9fd523bf40f581363b9a937b6e27bcbb0425e18d852230da0