Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfbf1172d05e4995…

MALICIOUS

PDF

78.6 KB Created: 2021-01-02 14:18:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 40517f5dcfa35c2412971febcfdc4aa7 SHA-1: 7f59e729ae1f45f4eea1a45b53dc4fb0cd08303a SHA-256: dfbf1172d05e4995d77d0d7eb8464841d571dc99b6e890057b65b2306b015f88
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm for SEO manipulation or to distribute malicious content. One critical heuristic indicates a link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly support a malicious classification. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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
  • 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://ggtraff.ru/aws?utm_term=bandstand+boogie+sheet+music
    • https://medizagokitoni.weebly.com/uploads/1/3/2/3/132303310/bewuvisobe.pdf
    • https://cdn.sqhk.co/vamunidibu/Vxpk9hi/repid.pdf
    • https://cdn.sqhk.co/jememobak/g5ghgso/zedadifoz.pdf
    • https://tolafapod.weebly.com/uploads/1/3/4/4/134486806/rumibo-ziwon.pdf
    • https://xowunaxevome.weebly.com/uploads/1/3/4/6/134679103/7241d9cde7237.pdf
    • https://jezaxegare.weebly.com/uploads/1/3/1/3/131380636/gupilogipupagip-joreku-juferagod-favovijodaf.pdf
    • https://suxugugufagiwa.weebly.com/uploads/1/3/4/7/134740592/cd265552.pdf
    • https://fofumugu.weebly.com/uploads/1/3/4/4/134445246/fumiduve.pdf
    • https://cdn.sqhk.co/ruvajuvewuj/bXijDiT/recharge_net_pack_gp.pdf
    • https://xujaxivef.weebly.com/uploads/1/3/1/4/131438557/2725789.pdf
    • https://cdn.sqhk.co/kupulifip/Sifiige/9175114008.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wunupalezozerud/antarctica_penguins_reading_answers.pdf
    • https://s3.amazonaws.com/pisedij/limitless_full_movie_123movie.pdf
    • https://s3.amazonaws.com/vifusupegiza/zegetos.pdf
    • https://s3.amazonaws.com/towakog/funny_christmas_shirts_canada.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcde.bin
3b1b64cbf5ccb0b9b80ddedca778671d6f0e177cf4bad27f64e48c7d62100072		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDE 5416 bytes
font_01_sfnt_off0000ef28.bin
2c28c63e2ebf510c04064b93c1d033814ba467a3738b6d8416d41f468b190b43		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF28 12180 bytes
font_02_sfnt_off0001180d.bin
541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1180D 16204 bytes

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