Malicious PDF — malware analysis report

Static analysis result for SHA-256 2300480bd3f3ad55…

MALICIOUS

PDF

124.6 KB Created: 2021-01-03 14:11:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 15e983e35463f80888e882d02059626e SHA-1: a55418822ebbbbf52deee723992a3ad0c0f8eb4e SHA-256: 2300480bd3f3ad55d88635d7f4037c1ca0e9f37bebf2110e71871a2f959ac3a6
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to domains that appear to be part of a link farm designed to manipulate search engine results. The primary URL, 'https://trafffe.ru/wb?keyword=holy%20roman%20empire%20history', suggests a lure to disguise malicious activity as a search result. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a phishing or trojan distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://trafffe.ru/wb?keyword=holy%20roman%20empire%20history PDF link annotation
    • https://kopopoxewa.weebly.com/uploads/1/3/4/5/134597570/1153614.pdfIn PDF document text
    • https://vobemebu.weebly.com/uploads/1/3/4/3/134383317/sizafoxelemuku.pdfIn PDF document text
    • https://filikegepux.weebly.com/uploads/1/3/5/3/135346592/8045433.pdfIn PDF document text
    • https://fulerisigimigo.weebly.com/uploads/1/3/4/5/134586495/1856139.pdfIn PDF document text
    • https://wesotapaxo.weebly.com/uploads/1/3/4/4/134488604/zefesafat.pdfIn PDF document text
    • https://xukafubisek.weebly.com/uploads/1/3/4/2/134265855/topuguwox-zavorelovoz.pdfIn PDF document text
    • https://nowusunomotir.weebly.com/uploads/1/3/4/3/134314498/badulaxikotaf.pdfIn PDF document text
    • https://sajipetifejej.weebly.com/uploads/1/3/4/8/134883768/sirukibevufej.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jebokizez/screen_video_recorder_software.pdfIn PDF document text
    • https://s3.amazonaws.com/bokofapig/gebamizikoreruze.pdfIn PDF document text
    • https://s3.amazonaws.com/tupofelasujewas/remove_duplicate_rows_in_rdlc_report.pdfIn PDF document text
    • https://s3.amazonaws.com/fedure/3dtuning_unlocked_apk.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b1ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B1AE 5124 bytes
SHA-256: a615ac50de85c8f3d47d704d1ac8a798fbc9419c9c471d0b16315a73222d47ee
font_01_sfnt_off0001c2eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C2EB 10160 bytes
SHA-256: cc6c3662f2216479b7c7b33abfa5c404e0f88ace2a8b8e2433bb1450565e8394

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