Malicious PDF — malware analysis report

Static analysis result for SHA-256 9682ece2c8777c51…

MALICIOUS

PDF

72.7 KB Created: 2020-12-26 08:33:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 1b5654f040a7483c6208abf082d0cd3b SHA-1: 9aa3ec32a62a74ad7cc620e054aa13a33c3e219e SHA-256: 9682ece2c8777c5151da708f7dced506faf70f7c713814374d9c6cd0933e750d
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically disguised as a 'Walmart order number on receipt'. This link, 'https://ggtraff.ru/123?utm_term=walmart+order+number+on+receipt', is the primary indicator of malicious intent. The file also exhibits characteristics of a PDF link farm, with numerous external links, suggesting a broader campaign to distribute malicious content or engage in SEO manipulation for phishing. The ML classifier and ClamAV detection further corroborate the malicious nature of this PDF.

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://ggtraff.ru/123?utm_term=walmart+order+number+on+receipt In PDF document text
    • https://tafedelimege.weebly.com/uploads/1/3/5/3/135345870/6254587.pdfIn PDF document text
    • https://jelijase.weebly.com/uploads/1/3/4/6/134694082/9204594.pdfIn PDF document text
    • https://mesipaku.weebly.com/uploads/1/3/1/3/131383407/pinekida-garuzodimewofes-sutugin.pdfIn PDF document text
    • https://jijalasigode.weebly.com/uploads/1/3/4/3/134344414/rupulirizadapub.pdfIn PDF document text
    • https://nitetezelimon.weebly.com/uploads/1/3/1/4/131438651/6dd307677.pdfIn PDF document text
    • https://lipowuripipu.weebly.com/uploads/1/3/1/3/131378852/fbdc88.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/henghuili-files2/88293994414.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/729c3626-7a82-47db-9437-201f2f51f058/bunusiga.pdfIn PDF document text
    • https://s3.amazonaws.com/perurulexi/academy_award_winning_movies.pdfIn PDF document text
    • https://s3.amazonaws.com/juvuraguvutoxif/riwibojigigasu.pdfIn PDF document text
    • https://s3.amazonaws.com/lakujusitejojet/gobudigesokib.pdfIn PDF document text
    • https://s3.amazonaws.com/dorobukasawituw/xexidafav.pdfIn PDF document text
    • https://s3.amazonaws.com/xeroguru/21597296958.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_off0000e113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE113 5196 bytes
SHA-256: 3cea8584697716e7a24582ff882bbd5d63a49896c7d3fc1ef9607cbed21fe61e
font_01_sfnt_off0000f2ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AC 10428 bytes
SHA-256: 8b0118b368c2204669ba062a676117a2a90717e0a6704f71a682d6125dbed489

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