Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e6c4cae34498814…

MALICIOUS

PDF

81.0 KB Created: 2021-01-17 19:29:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 731635b4609bb0c46f3578dfd17c8f9a SHA-1: 757ba756a3d6c79b0c5b2dfa6129f4720935989e SHA-256: 9e6c4cae3449881425b80a3d8f3a105a7f4115ee4936f559ddd0f3873f7df73e
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic identifying a link to known malicious redirector infrastructure. Additionally, a critical heuristic detected a link farm of numerous PDF files, suggesting a coordinated effort to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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://traffmen.ru/123?utm_term=common+purposes+of+technical+writing In PDF document text
    • https://site-1172117.mozfiles.com/files/1172117/kitten_match_mod_apk_android_1.pdfIn PDF document text
    • https://tarivoda.weebly.com/uploads/1/3/4/6/134693378/3302977.pdfIn PDF document text
    • https://site-1177364.mozfiles.com/files/1177364/dream_league_soccer_2020_vs_fifa_mobile.pdfIn PDF document text
    • https://site-1176821.mozfiles.com/files/1176821/81865458831.pdfIn PDF document text
    • https://site-1168441.mozfiles.com/files/1168441/telecine_play_apk_3__0__63.pdfIn PDF document text
    • https://site-1166042.mozfiles.com/files/1166042/bendix_brake_catalogue.pdfIn PDF document text
    • https://site-1193936.mozfiles.com/files/1193936/smoothie_king_berry_punch_copycat_recipe.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/febopa/22297660131.pdfIn PDF document text
    • https://s3.amazonaws.com/fukezavazuj/60769231454.pdfIn PDF document text
    • https://s3.amazonaws.com/mejados/casida_industrial_microbiology.pdfIn PDF document text
    • https://s3.amazonaws.com/vavabi/40137605039.pdfIn PDF document text
    • https://s3.amazonaws.com/vasofirida/6242225792.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_off0001003a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003A 5428 bytes
SHA-256: 70f173d6a3b4c4c132f3964e6755dc15a732e07c6fa18a401afba23ba0e17f70
font_01_sfnt_off00011297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11297 10708 bytes
SHA-256: bfafca319f15202eafff1f6b075663791c9a71a91424bf0e6aa844f69228eedb

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