Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a148ff156d833df…

MALICIOUS

PDF

74.3 KB Created: 2020-12-29 19:13:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 5c7a5b3247e1e3944fec5f1ec550641d SHA-1: 9ea8a4a566090627fbdac2938c1a22d2d7b33994 SHA-256: 2a148ff156d833dfb2f1544ea41487083cc8010c82e3c51d12ed668007802aba
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many of which appear to be part of an SEO link farm designed to redirect users. The primary redirector URL is `https://trafficel.ru/strik?utm_term=reversible+reaction+examples+gcse`, which is likely used for phishing or malware distribution. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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.
  • 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://trafficel.ru/strik?utm_term=reversible+reaction+examples+gcse PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383156/normal_5fa4ea72c6a80.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413469/normal_5fcaf549c40fa.pdfIn PDF document text
    • https://biwasigefo.weebly.com/uploads/1/3/1/3/131398444/7245869.pdfIn PDF document text
    • https://cdn.sqhk.co/rewazexi/tzC38gi/29369623116.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371265/normal_5fcbfe5ec31c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414860/normal_5fb3766ebf80e.pdfIn PDF document text
    • https://pukogapuwobar.weebly.com/uploads/1/3/4/3/134307851/ripepofanewiluf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425921/normal_5f9b426c061f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481841/normal_5fbf17ee7b453.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415334/normal_5fcedb2292e73.pdfIn PDF document text
    • https://cdn.sqhk.co/vumivatuvi/i6hhjeP/chess_board_layout_and_rules.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/jevedijadiki/prime_factorisation_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/xutomoxu/acvim_cardiology_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/xapijifas/92156666950.pdfIn PDF document text
    • https://s3.amazonaws.com/towutoginadivu/jolly_roger_bay_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/faxaxos/magnetism_worksheet.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_off0000e62f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62F 5528 bytes
SHA-256: 5451063cbbc3474cc998a7b55a6f0d8952c8904f2ed63e5d4de9400012918085
font_01_sfnt_off0000f8f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F4 10340 bytes
SHA-256: 63a4459d18151861ca51455b109d9036402333d70ed8fd6dbf4288715110299d

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