Malicious PDF — malware analysis report

Static analysis result for SHA-256 4175f27a2845245d…

MALICIOUS

PDF

77.4 KB Created: 2020-12-29 22:48:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d520275f51e09a9e52fc4ab599cc7d23 SHA-1: 13dd478cd06f1d894f6888e18bacf22f66973bb3 SHA-256: 4175f27a2845245dd16660eb9709654fda5da04cc4a0d8bf6f644b49f0cf4e1f
184 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical alert for linking to known malicious redirector infrastructure. The embedded URLs and the nature of the document content, despite being heavily obfuscated, point towards a phishing or scam campaign. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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 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=fire+in+the+hole+short+stories
    • https://tumupexaru.weebly.com/uploads/1/3/4/3/134333537/9374417.pdf
    • https://gopogaxewose.weebly.com/uploads/1/3/4/0/134013169/dosefal.pdf
    • https://dobopekajami.weebly.com/uploads/1/3/4/3/134314215/33c1cc61d04a325.pdf
    • https://povutepumik.weebly.com/uploads/1/3/2/7/132741486/9622836.pdf
    • https://rawiranuxox.weebly.com/uploads/1/3/4/6/134618620/7009589.pdf
    • https://cdn-cms.f-static.net/uploads/4369911/normal_5fe6eec0d4153.pdf
    • https://benipotuwazel.weebly.com/uploads/1/3/4/4/134445242/a20838c1557c.pdf
    • https://jedawakebikota.weebly.com/uploads/1/3/4/7/134715316/1213987.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/zuxime/instagram_apk4fun_history.pdf
    • https://uploads.strikinglycdn.com/files/9b259433-08f7-445e-ae1a-278d4c699585/58464557504.pdf
    • https://uploads.strikinglycdn.com/files/f9bc209e-d20a-4c23-897b-9671c7d3c8de/toseronurenuganomefini.pdf
    • https://s3.amazonaws.com/vatosolikijike/38297847218.pdf
    • https://s3.amazonaws.com/tifuwuw/edit_online_free_text.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfd5.bin
2392c3d34b10948027222e11f7942340eb48d15c6d2aab3f8ca759fa134107e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD5 4308 bytes
font_01_sfnt_off0000ee52.bin
e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE52 1800 bytes
font_02_sfnt_off0000f6e0.bin
3212a73f620e56e0c24c7e7218fd0df84493ae89d49bb6cd1139a33434bdee3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E0 10272 bytes
font_03_sfnt_off00011a27.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A27 4324 bytes

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