Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b6dd120f3ae434f…

MALICIOUS

PDF

77.1 KB Created: 2020-11-25 06:18:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: b4922febb9511ad0a0ba9f19d39d0e3e SHA-1: ec72e313b657897af87b69b0e2a70ea67cac0588 SHA-256: 1b6dd120f3ae434f3e1ac6839370860a6576796df4919c973fbc40460bb27854
254 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple heuristics indicating it is a malicious redirector and part of an SEO link farm, designed to lead users to harmful websites. The embedded URLs, such as 'https://traffine.ru/strik?utm_term=one+man+gang+uwf', are flagged as malicious redirectors. The ML classifier and ClamAV detection strongly support the malicious nature of this file, likely used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://traffine.ru/strik?utm_term=one+man+gang+uwf In PDF document text
    • https://poriveba.weebly.com/uploads/1/3/4/3/134316211/6d5dfb45ca31.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443809/normal_5f9ee3b6b73cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368222/normal_5f879a41ca9de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382773/normal_5f926a14705f3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4026e1d-50bd-4c40-b429-c3222e2f6f04/damapakevuvemipux.pdfIn PDF document text
    • https://s3.amazonaws.com/kudefem/tomesaj.pdfIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/57606813794.pdfIn PDF document text
    • https://s3.amazonaws.com/mawesenasijoser/viwinopilizotejukutate.pdfIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/juvolososego.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae28067b-b5b3-4418-9b65-995188d97f84/dudus.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/anemia_perniciosa_diagnstico.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_off0000f0ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BA 4900 bytes
SHA-256: cc308dfbb1fee58e0600cf4217ec46724223fdde3088d64648776eb37c743894
font_01_sfnt_off0001016f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016F 11536 bytes
SHA-256: 607503aa2d342678be57e015057693b1ba92fdd8a650a72729d1c083c662c4c6