Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9c6e2b48695805e…

MALICIOUS

PDF

76.0 KB Created: 2021-04-06 03:58:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 42e9b5b2929e6ccd99207b5fe34c0055 SHA-1: 79df955fa577ef28fb55d9f03f3ef5cc7026b3c9 SHA-256: c9c6e2b48695805eac1daed701c069b2b77e143ded0756ab9f7dd13874e408ef
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, flagged as a link farm, with one URL pointing to a suspicious domain. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm suggest it's designed to redirect users to malicious content.

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://nipisod.ru/aws?utm_term=basic+electronics+tutorial+video
    • https://cdn-cms.f-static.net/uploads/4366308/normal_6027f2dbe0b9c.pdf
    • https://cdn-cms.f-static.net/uploads/4391925/normal_6060f9c961f67.pdf
    • https://cdn-cms.f-static.net/uploads/4408324/normal_5fd336fe486b5.pdf
    • https://cdn-cms.f-static.net/uploads/4387241/normal_604d910cf35f8.pdf
    • https://cdn-cms.f-static.net/uploads/4484169/normal_604f3c85b3d2f.pdf
    • https://static.s123-cdn-static.com/uploads/4426957/normal_6004a7a62fbb6.pdf
    • https://cdn-cms.f-static.net/uploads/4414672/normal_602464f92e5cc.pdf
    • http://gemixemufasu.22web.org/53541542634.pdf
    • http://gijemafovipa.iblogger.org/xujalibopux.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e6b56e3c-1b88-4cfb-972d-ab1702b0a06e.filesusr.com/ugd/8c0e65_6ba82062bba5442784514d899d400478.pdf?index=true
    • http://badokelo.rf.gd/13845214832.pdf
    • https://e2a3f85e-3ce8-4c76-99a2-e63219cad5ad.filesusr.com/ugd/473d25_41d2cc20c75e4dbc9f6bbb01312aa6db.pdf?index=true
    • http://suwagovi.epizy.com/97_jeep_wrangler_patch_panels.pdf
    • http://karajifaderiwow.epizy.com/sazab.pdf
    • https://1f571a09-6495-4108-bd1a-9715deae29b5.filesusr.com/ugd/b0bf26_06d20a7021f045319bb74f236fd6b24f.pdf?index=true
    • https://c18d7360-3707-4bf1-9d6f-52ba7510fa17.filesusr.com/ugd/76cb06_2eaa56b1f47c4f70ba348cece963c9d1.pdf?index=true
    • https://0cc2a7d0-6f33-4335-9ec9-554d9418487e.filesusr.com/ugd/cb4a18_8b2de461625f4fcf90e4fbe297e8cd20.pdf?index=true
    • https://aaf2f8d8-4593-4070-95c3-ed2308805076.filesusr.com/ugd/337eea_7ff997b68d684d1f89ab3c4202611375.pdf?index=true
    • http://fuzariwa.rf.gd/cheat_droid_free_apk.pdf
    • http://vumebef.epizy.com/viwimotasijavivo.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_off0000eb97.bin
abcff6ec6ac93e7cdf805bec3a59c9079fa844b7948e33814e4071ed81f9866a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB97 5040 bytes
font_01_sfnt_off0000fccd.bin
0a2d56591b392ef83559a78e97f6d92e8b99dde69d3560241d509371670d94ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCD 11156 bytes

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