Malicious PDF — malware analysis report

Static analysis result for SHA-256 d054953a9f19acb2…

MALICIOUS

PDF

80.4 KB Created: 2021-05-29 18:31:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc6d46dd5dde4778e832db4a354ffc5e SHA-1: 6fa5a7197e9bee28f4b6dc0458f197ac377c3563 SHA-256: d054953a9f19acb2d05e4a758a64e83ab9ad4ccf2f973db0000966390196f353
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' containing 30 links. The primary malicious URL identified is 'https://druttle.ru/123?utm_term=briefing+template+agency'. ClamAV and an ML classifier also flagged this PDF as malicious, indicating a phishing or trojan distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://druttle.ru/123?utm_term=briefing+template+agency
    • https://cdn-cms.f-static.net/uploads/4490735/normal_601a99ad36ea0.pdf
    • https://static.s123-cdn-static.com/uploads/4475215/normal_5fdd2217bf81c.pdf
    • https://cdn-cms.f-static.net/uploads/4457839/normal_600ef75442cda.pdf
    • https://cdn-cms.f-static.net/uploads/4401982/normal_5fdae1f7bc0cf.pdf
    • https://ranadapibefa.weebly.com/uploads/1/3/0/8/130874213/abf94e3cc5eb3ee.pdf
    • https://kupufulat.weebly.com/uploads/1/3/4/6/134643140/netato.pdf
    • https://lukofobetu.weebly.com/uploads/1/3/4/3/134317857/96d1ec4f66a9.pdf
    • https://kaxizaro.weebly.com/uploads/1/3/5/3/135349404/4487083.pdf
    • https://wipuzene.weebly.com/uploads/1/3/5/9/135971348/2220705.pdf
    • https://pejejejepo.weebly.com/uploads/1/3/2/6/132682076/862798.pdf
    • https://xegavepixax.weebly.com/uploads/1/3/1/4/131452872/netofigasovuk.pdf
    • https://cdn-cms.f-static.net/uploads/4459057/normal_602f19eb98eda.pdf
    • https://fozikubovofow.weebly.com/uploads/1/3/4/8/134897471/ad8ae7a643e9c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/ec368f14-4b84-4f0b-92aa-d2d9fa031368/fomakajizinixile.pdf
    • https://uploads.strikinglycdn.com/files/82eaed6c-a2b3-49b6-87f6-839395055759/how_to_rig_for_sea_trout.pdf
    • https://uploads.strikinglycdn.com/files/58277a6f-5847-45de-ad9d-37b10d3b60f8/task_scheduler_error_code_0x3.pdf
    • https://uploads.strikinglycdn.com/files/f462838b-c43b-4f8a-a8f5-a35eaad381e8/south_carolina_drivers_test_book.pdf
    • https://uploads.strikinglycdn.com/files/780222f4-d283-45ae-bdf6-2f1bbde60de3/53600169022.pdf
    • https://uploads.strikinglycdn.com/files/c994425d-661e-4b51-bb03-853f40114558/jizos.pdf
    • https://uploads.strikinglycdn.com/files/08b45c79-01b5-4145-9f2b-ebc5dd21cc71/lufux.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0bc.bin
e0b9414c2fc8d1d9f3be3a0bd05a0d48391ed6c2d319ce5d7bc8aedabc7c51c2
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BC 4988 bytes
font_01_sfnt_off0001019a.bin
7c158a30b34d808875e5937fecb74191e20c069bb3a36e88f8091e2d87f6669d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1019A 10620 bytes
font_02_sfnt_off000125fa.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
pdf-font-stream PDF embedded font (sfnt) at offset 0x125FA 4324 bytes