Malicious PDF — malware analysis report

Static analysis result for SHA-256 cff8ef9c659b1174…

MALICIOUS

PDF

73.2 KB Created: 2021-02-12 20:44:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: fcd274028da9b39ea9d799c321bd8214 SHA-1: bfc42aace8beafaf0c2ee9a771f1452bdaa4407f SHA-256: cff8ef9c659b11745c0e7566cc7b291b953330db1c922df9beb16282642be887
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document is classified as malicious by ML and ClamAV, and contains numerous embedded URLs pointing to link farms and potentially malicious content. The document body, though heavily obfuscated, suggests a lure related to a 'school dress code', which is a common tactic for phishing or scam operations. The presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a deliberate attempt to direct users to a network of potentially harmful websites.

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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jacksth.ru/wix?keyword=sagewood+middle+school+dress+code PDF link annotation
    • https://cdn.sqhk.co/kitujesijak/eFUhggc/63659713995.pdfIn PDF document text
    • https://cdn.sqhk.co/saguregifu/UhaLiho/exploration_and_colonization_quiz_1_req.pdfIn PDF document text
    • https://cdn.sqhk.co/zujubokave/iShfq7C/cool_games_to_play_with_friends.pdfIn PDF document text
    • https://cdn.sqhk.co/fapolokid/KlidQje/nelopewi.pdfIn PDF document text
    • https://cdn.sqhk.co/fejavegiwo/qrFjegi/first_birthday_cake_designs_for_baby_boy.pdfIn PDF document text
    • https://cdn.sqhk.co/rivotoxupow/vihhfgG/fejifebuwobumedo.pdfIn PDF document text
    • https://cdn.sqhk.co/wopidevepip/giijhgN/82637037041.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409118/normal_5fc9aa12bf291.pdfIn PDF document text
    • https://cdn.sqhk.co/bigulikexupa/as0qjfH/73197252585.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476946/normal_5fef70973592d.pdfIn PDF document text
    • http://astropsychology.website/southwest_airlines_case_study_analysisem5nr.pdfIn PDF document text
    • http://raruranakadup.iblogger.org/6914280277.pdfIn PDF document text
    • http://xoxinusenavi.66ghz.com/dog_barking_remix_ringtone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474739/normal_5fd3ce35d92a8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://boreduse.rf.gd/cartoon_printed_double_bedsheet.pdfIn PDF document text
    • http://vubixegigag.rf.gd/19123524574.pdfIn PDF document text
    • http://vulewibof.epizy.com/76964091011.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_off0000e008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE008 5548 bytes
SHA-256: fdf8df512771c7831d996fd48a30c90a4c043b0211e8a3cff9369967da758cc1
font_01_sfnt_off0000f2cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CB 10828 bytes
SHA-256: c1a27e20565fda6e5dc92c4d569545a27d212255e4a761d189e4177faaa5aa18

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