Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c311f29c044961c…

MALICIOUS

PDF

81.8 KB Created: 2021-02-14 08:34:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 8b2f53a2ce0df0088467d3463d3e39fd SHA-1: 996bd4cbae97cdd1e43b2c60be8fc2708a23b2c3 SHA-256: 1c311f29c044961ccd4c5face359cadade64cd84cb87c475de1f320231d924d5
194 Risk Score

Malware Insights

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

The PDF contains heuristics indicating it links to known malicious redirector infrastructure, specifically `https://yafferge.ru/123?utm_term=alabama+board+of+nursing+telephone+number`. This URL is likely used to phish for information or deliver a secondary payload. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

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.
  • 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://yafferge.ru/123?utm_term=alabama+board+of+nursing+telephone+number In PDF document text
    • https://cdn-cms.f-static.net/uploads/4527357/normal_5fd1f876f2abc.pdfIn PDF document text
    • http://everydayy.fun/44216281341rmbip.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500895/normal_6002ed8bf0dad.pdfIn PDF document text
    • http://zavarivaemvmeste.ru/88617530902a1fas.pdfIn PDF document text
    • https://cdn.sqhk.co/kejofuvata/g4tjagf/queen_greatest_hits_songs_mp3.pdfIn PDF document text
    • https://s3.amazonaws.com/perurulexi/dafelorin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455374/normal_60229f4ef0b7c.pdfIn PDF document text
    • https://cdn.sqhk.co/xiwapusumoge/ifhuASK/modern_warfare_3_weapon_list.pdfIn PDF document text
    • https://s3.amazonaws.com/wudibirewuduto/muvewubagepujag.pdfIn PDF document text
    • https://cdn.sqhk.co/fedovipawe/3BHihji/77491198578.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414173/normal_60214b6d35180.pdfIn PDF document text
    • https://cdn.sqhk.co/veludewozen/hctLU01/flying_bike_simulator_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off000101fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101FB 5584 bytes
SHA-256: 332fb352e087e1d50063d3f0100ad140c6c2f483e23df8a0b2abf747b219b8b7
font_01_sfnt_off000114c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C7 10960 bytes
SHA-256: d6f85d98f1b251c0a2d32d0427343f8560e2383bf57d187bba7c5bc1c354dc09