Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5ffc544e9947834…

MALICIOUS

PDF

90.7 KB Created: 2021-02-27 07:24:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 26f35fa0836a2e2f125d263139900120 SHA-1: 2c9bba9b4ad371ffeb709d83182b121e506e3333 SHA-256: b5ffc544e99478349aaf1fe61a1456f1a64306dbaeb66c87a26715d8fd57c98c
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or redirection scheme. The document body, though heavily obfuscated, contains references to 'Wings of Fire graphic novel 10' and 'wkhtmltopdf', indicating a lure to disguise the malicious intent of directing users to external, 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://midufefew.ru/123?utm_term=wings+of+fire+graphic+novel+10 PDF link annotation
    • https://cdn.sqhk.co/fazologim/af4hjDp/20260729429.pdfIn PDF document text
    • http://tefituguj.iblogger.org/annual_report_2018.pdfIn PDF document text
    • http://pawomodom.medianewsonline.com/shoprider_mobility_scooter_battery_change.pdfIn PDF document text
    • https://cdn.sqhk.co/kelopifagisu/3FisFqb/air_control_hd_3._86_apk.pdfIn PDF document text
    • http://towufato.mywebcommunity.org/pudovalofowolege.pdfIn PDF document text
    • http://wusefarowakuzux.iblogger.org/yamaha_motif_6_price.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467036/normal_5ff8200aaf82e.pdfIn PDF document text
    • https://cdn.sqhk.co/xopigotax/d1Vkgf8/najejurumexig.pdfIn PDF document text
    • http://boxberry-24.cc/lowiwidatetinutubawixagaxygqyh.pdfIn PDF document text
    • http://fanisore.sportsontheweb.net/axiom_pro_49_power_supply.pdfIn PDF document text
    • http://watasanu.iblogger.org/cat_and_dog_movie_tamil.pdfIn PDF document text
    • https://cdn.sqhk.co/kawurefeki/gMdq50G/nikah_word_meaning_in_arabic.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://tumurubulofomam.rf.gd/spelling_numbers_worksheet_1_to_50.pdfIn PDF document text
    • http://xesidif.epizy.com/2107652362.pdfIn PDF document text
    • http://mixomexazuvoxod.rf.gd/girimepiw.pdfIn PDF document text
    • http://xefakasafaze.epizy.com/black_and_decker_cordless_trimmer_not_working.pdfIn PDF document text
    • http://gonulurejojele.epizy.com/action_plan_format_for_business.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000115c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C0 5252 bytes
SHA-256: 0b9f982da678161bae51588c2c7d4ff5f61b7c83bd5a2bee4b5a986c3410c57a
font_01_sfnt_off000127a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127A3 11356 bytes
SHA-256: beff0234d53c782aa5d96ddadf47ac72b314477f5993e32b3b0b05e1b7511992
font_02_sfnt_off00014dba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DBA 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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