Malicious PDF — malware analysis report

Static analysis result for SHA-256 477e396476de0244…

MALICIOUS

PDF

74.1 KB Created: 2021-03-15 03:46:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 16931e2869d606aa6cf077da9338df02 SHA-1: 256f7c6399ce9a233a20fe0647135200518b0764 SHA-256: 477e396476de024417767418c754f7bb42f773551c31494932bde00f1ca946a6
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier also indicate malicious content. While no scripts were explicitly extracted, the PDF structure and external links strongly suggest a phishing or malicious redirection scheme.

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/wix?keyword=uncommon+service+book+pdf
    • https://zupufirelerige.weebly.com/uploads/1/3/0/9/130969681/3906347.pdf
    • https://static.s123-cdn-static.com/uploads/4369504/normal_5ff176a6c4a0a.pdf
    • https://cdn.sqhk.co/fotinegataso/b9gdKQg/turigexoxexanizigad.pdf
    • https://cdn.sqhk.co/xexisini/icsfVNj/dobosutorogubilubaj.pdf
    • https://cdn.sqhk.co/pananumujo/Jjdhhif/in-_q-_tel_australia_ltd.pdf
    • https://cdn.sqhk.co/netimawifes/g2iirdh/fadomavaxatezidubilutude.pdf
    • https://static.s123-cdn-static.com/uploads/4489977/normal_5ff41e91dea1b.pdf
    • https://naziwimirup.weebly.com/uploads/1/3/4/3/134371197/lavux.pdf
    • https://cdn-cms.f-static.net/uploads/4406775/normal_6041d45fb45b8.pdf
    • https://cdn.sqhk.co/fepexeguma/jgjhdDG/stereo_mix_app_for_pc.pdf
    • https://cdn.sqhk.co/nufesewepi/jjhhkjg/latonajal.pdf
    • https://cdn.sqhk.co/rimudatige/gheqaFf/tiwitezanu.pdf
    • https://cdn.sqhk.co/nazabimon/d0f8ij4/adadadada_song_lyrics.pdf
    • https://tumulole.weebly.com/uploads/1/3/6/0/136054957/kapodowawojisegije.pdf
    • https://cdn-cms.f-static.net/uploads/4489976/normal_602d9bcad1c66.pdf
    • https://cdn-cms.f-static.net/uploads/4367680/normal_600c000845a76.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/8670cc22-4117-4983-aaab-b8ec863a1dfd/bometuwugajemaxipotoru.pdf
    • http://lasiliroba.epizy.com/52288670907.pdf
    • http://tidejixegiseput.epizy.com/59568982085.pdf
    • https://uploads.strikinglycdn.com/files/10bb73ff-1226-4d1a-b73b-7b06cbd00015/94199122468.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_off0000e485.bin
13d6aa3559abbcb53051c74d0842296e15da203ca57b1ec2fadf1b50110f1c78		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE485 5316 bytes
font_01_sfnt_off0000f693.bin
8b0f75b64e876f07db1f8b7c2267110dff64d62f2bf08a6619b35b3e435947b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF693 11144 bytes

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