Malicious PDF — malware analysis report

Static analysis result for SHA-256 7837d5c49c74b422…

MALICIOUS

PDF

70.3 KB Created: 2021-03-03 21:49:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 7224d5c29ae18393865ba0f833ac3bb4 SHA-1: dd9d81a17bc41d33f91ea70776077495f12318f5 SHA-256: 7837d5c49c74b4229797e7277c7167fee2cbacd4847a6009569b62bb62a37c01
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains multiple external URIs, including one hosted on disposable infrastructure, suggesting a link farm or redirection to malicious content. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a keyword 'mymcps classroom zoom', which likely serves as a lure to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://bologen.ru/wix?keyword=mymcps+classroom+zoom PDF link annotation
    • http://kinokaiff.space/co_teacher_job_descriptionchozm.pdfIn PDF document text
    • http://vir-tus.com/rerolipeisqsu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408582/normal_6035f612dff19.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417662/normal_5ff0157da9e4f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460232/normal_600e41a92d2e2.pdfIn PDF document text
    • http://ygrash.website/hunterborn_skyrim_serc8s9.pdfIn PDF document text
    • http://espaceabonnes.com/allu_arjun_songstdrlj.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/najubu/introduction_to_bipolar_junction_transistor.pdfIn PDF document text
    • https://s3.amazonaws.com/kimone/arithmetic_and_geometric_progression.pdfIn PDF document text
    • http://bemabam.myartsonline.com/pretty_little_liars_episode_guide_season_3.pdfIn PDF document text
    • https://s3.amazonaws.com/wuxupewu/rigidikomegijamofaxisaki.pdfIn PDF document text
    • http://xikavab.epizy.com/honda_ridgeline_transmission_replacement_cost.pdfIn PDF document text
    • http://pudekixepubaz.epizy.com/animal_kingdom_us_episode_guide.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_off0000d649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD649 5236 bytes
SHA-256: 00520a43671260c62d97b0498be803cd541dd18381c592425f8beb1cfec107a0
font_01_sfnt_off0000e81d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81D 10800 bytes
SHA-256: efb1f81963d1b7d42172b3c40c499083fbf082289cc9c7fab5662b7ac4bc0160

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