Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f566babe29d3f92…

MALICIOUS

PDF

75.2 KB Created: 2021-03-16 21:05:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 532851ababb32d797133753610f83717 SHA-1: 060337cc5caf62c02c89d10e10fb9ba5e7cc7287 SHA-256: 5f566babe29d3f922894b8b89f130179add8b95774b95be3911533a931edb02d
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a large number of external links, many pointing to PDF files hosted on services like Weebly, suggesting a link farm or SEO manipulation tactic. One of the embedded URLs, https://dafemum.ru/wix?keyword=2013+amc+10a+cutoff, is directly associated with the file's content, indicating a potential phishing lure or redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dafemum.ru/wix?keyword=2013+amc+10a+cutoff
    • https://bupuzufemu.weebly.com/uploads/1/3/1/4/131452870/jemuv-tarapoto.pdf
    • https://loleritukala.weebly.com/uploads/1/3/0/9/130969936/texifido.pdf
    • https://gejidodedawo.weebly.com/uploads/1/3/4/0/134018108/pukupalidizelov.pdf
    • https://cdn.sqhk.co/jadosoxiko/hejgifB/knockout_epic_race_3d_model.pdf
    • https://cdn.sqhk.co/zelosoza/bhfhiod/xumizodutikotukasuje.pdf
    • https://kigolakelo.weebly.com/uploads/1/3/1/3/131380934/9708336.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://55f5e71c-5f54-469f-9449-301c43944234.filesusr.com/ugd/bbdb65_c64e89c1f6034c3fb2ae90f82e10bd4f.pdf?index=true
    • http://lenadupubop.rf.gd/baskerville_t_regular_font_free.pdf
    • https://s3.amazonaws.com/gagagakigibapo/48389968725.pdf
    • https://uploads.strikinglycdn.com/files/fc61096a-8f86-47ac-b457-7bd6412938da/wesawetewosoji.pdf
    • https://s3.amazonaws.com/febopa/89421890573.pdf
    • https://uploads.strikinglycdn.com/files/361331da-c2d2-4a8e-a92f-e0b96fc19c41/26874534313.pdf
    • https://fb79ad55-22b5-4823-9538-35c71bbbd514.filesusr.com/ugd/ea423f_16b95663c58b4e168573dcc81124b47e.pdf?index=true
    • https://1261df91-4e32-40b2-8b8a-4050d3c54cbb.filesusr.com/ugd/df69c1_6100274327884cdf93b8148a470ae896.pdf?index=true
    • https://s3.amazonaws.com/xaliwalufoguni/good_will_hunting_script.pdf
    • https://s3.amazonaws.com/lopadivupudexa/7896044842.pdf
    • https://00c0516a-c822-4344-a779-6f74e039753d.filesusr.com/ugd/9e41f0_84b3386067e846979897c642cd4301b0.pdf?index=true
    • https://s3.amazonaws.com/damerirazib/adfly_bypass_apk.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_off0000e5f7.bin
9d6f124603c0ae1cdede4188a2ba8b36687ca0537d134b2fe9b964e6b8490ccd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F7 5116 bytes
font_01_sfnt_off0000f75d.bin
d8c4b9eb96bab282feba21f3b13016b2e4695e6c5973ca73a0b1dd9198b1c251		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF75D 11452 bytes

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