Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a1c0cb3a40e6950…

MALICIOUS

PDF

98.1 KB Created: 2021-05-19 01:30:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d53c673a556b7bfe283b6f14e50207e7 SHA-1: b8cf3da08bb07f327b25bdeed566b7eb36907830 SHA-256: 1a1c0cb3a40e695063954e42010c8dedb98d87c682d981cb2597f3be77d06186
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL pointing to zajinet.ru, which is flagged as unknown reputation. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm or SEO spamming activity. ClamAV detection and ML classification strongly indicate maliciousness, likely related to phishing or malware distribution.

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://zajinet.ru/strik?utm_term=pokemon+fire+red+randomizer+download+mac
    • https://cdn-cms.f-static.net/uploads/4455207/normal_600c000e25faa.pdf
    • https://cdn-cms.f-static.net/uploads/4485939/normal_6015816d7096b.pdf
    • https://static.s123-cdn-static.com/uploads/4467285/normal_5ffcc902779f8.pdf
    • https://toxosujaduwo.weebly.com/uploads/1/3/0/8/130874389/murefedoz.pdf
    • https://cdn-cms.f-static.net/uploads/4384167/normal_5fd68bbe99607.pdf
    • https://dukuvurijo.weebly.com/uploads/1/3/4/5/134522813/6811347.pdf
    • https://static.s123-cdn-static.com/uploads/4426572/normal_5feb98bacf62a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/4a3ef374-a903-41d6-b07a-59d0e22c9ed7/how_to_repair_a_poulan_chainsaw.pdf
    • http://zunimesigo.rf.gd/daewoo_e_c_annual_report_2018.pdf
    • https://uploads.strikinglycdn.com/files/db725e5e-c3d8-4eaf-b787-56096362ff59/sony_mdr-rf985rk_price.pdf
    • https://s3.amazonaws.com/rizoli/word_rhymes_paris.pdf
    • https://s3.amazonaws.com/xurixado/tizom.pdf
    • http://rojolegov.epizy.com/95659554909.pdf
    • http://wotofuwib.epizy.com/39281503518.pdf
    • https://s3.amazonaws.com/xifabilejilab/61498348421.pdf
    • https://uploads.strikinglycdn.com/files/6df8e9ae-6cff-47ad-abb0-368294ce0c8e/20249243592.pdf
    • https://s3.amazonaws.com/dovulavavo/photo_collage_template_pages.pdf
    • https://s3.amazonaws.com/wixamupelinere/behringer_x_air_xr16_manual.pdf
    • https://s3.amazonaws.com/serogajugomiji/38185737189.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_off0001417a.bin
f20b82ac0370938d2fa3626c67d033ab76d1fe84fbad55c329827b3146e015e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1417A 5196 bytes
font_01_sfnt_off00015336.bin
f6e8044c4b14b4ea912bf8f43d1cc346843875576932e1ac9139612ba59e9e18		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15336 11792 bytes

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