Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cd48c5475788ad9…

MALICIOUS

PDF

81.4 KB Created: 2021-02-28 14:55:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 99f4c2ec4f2450a0eb13badd8200d6d0 SHA-1: 6b98e2c24036c8fa0066f006df56018a4f6002e5 SHA-256: 6cd48c5475788ad9e0e9eecc0ae34ae1054f1dfaea53cd2ca2c3fff1dc4d4caf
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file employs a common SEO-based lure, masquerading as a 'physics workbook answer key' to attract users. It contains a large number of external links, many of which point to other PDF files, suggesting a link farm or redirector strategy. The presence of multiple PDF_SEO_LINK_FARM and PDF_SEO_UTM_REDIRECTOR_LINK heuristics, along with a high ML score and ClamAV detection, strongly indicates malicious intent, likely to drive traffic to malicious sites or deliver further payloads.

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://zajinet.ru/wix?keyword=prentice+hall+conceptual+physics+workbook+answer+key PDF link annotation
    • http://ruguwafe.scienceontheweb.net/kifabezadagutiraviba.pdfIn PDF document text
    • https://vowebaxuzifov.weebly.com/uploads/1/3/0/7/130738870/vazadewade.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475864/normal_5fd5ff30abce3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463565/normal_603115a42cfb4.pdfIn PDF document text
    • https://sejiganabukuja.weebly.com/uploads/1/3/4/5/134585043/lejujekozigito.pdfIn PDF document text
    • http://letnesil.xyz/hp_2013_ultraslim_docking_station_display_portcz777.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367650/normal_5fed5912cced1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425514/normal_60031869e912a.pdfIn PDF document text
    • http://mifvideo.space/acoustic_guitar_lessons_near_mexzpy6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370780/normal_5fcb6ea989257.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449777/normal_5ff3043ca1f91.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446649/normal_5feef65a2a448.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480170/normal_6011ad0f4fc96.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426679/normal_600c8f0f26f79.pdfIn PDF document text
    • http://sutiboju.sportsontheweb.net/how_can_i_learn_about_stock_market.pdfIn PDF document text
    • http://fipizilemuwob.medianewsonline.com/fitexujanotujagerete.pdfIn PDF document text
    • http://damita.fun/xojarokekavuvenurivodamiziy4w6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413835/normal_6014587f84c74.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lumosaneja.onlinewebshop.net/62373633240.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_off0001022e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022E 5420 bytes
SHA-256: 374491d78457a8d78f01fd28760e2248f91c73200900506ebef8f3570f1fbf37
font_01_sfnt_off000114a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A9 10408 bytes
SHA-256: d24dd2185affc0cf17056e367e7fcc0a989a57391faa1f61a0a48a86c763d7f6

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