Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b8a4d36bc98675f…

MALICIOUS

PDF

97.1 KB Created: 2021-03-21 10:58:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: db5cce6f5115eaa4abb10438a18af8b7 SHA-1: 740deee6f7c4857c5a9d63b8d41413def9669c42 SHA-256: 1b8a4d36bc98675f4b610426b805aa12f0dcc9a6a25963095048e15b56338e6a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a URL that appears to be a lure for academic content. The presence of numerous external URIs, including one hosted on disposable infrastructure, strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/wix?keyword=dbq+3+the+middle+ages+document+answer+key PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421957/normal_6015e3a971380.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481540/normal_603e960070015.pdfIn PDF document text
    • http://mebets.xyz/sony_sa-ct260h_will_not_turn_onedjr8.pdfIn PDF document text
    • http://winfreeiphone.xyz/how_to_turn_on_my_ge_ovenafj2r.pdfIn PDF document text
    • http://mexicotop.xyz/driver_booster_4_keya16g1.pdfIn PDF document text
    • https://kufudazasa.weebly.com/uploads/1/3/4/6/134626120/f57f8b0666.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369915/normal_603c1de0d6ed9.pdfIn PDF document text
    • http://fotonagosuslugi-01.space/jekilamozodinegotuvapo0cc0f.pdfIn PDF document text
    • http://50offit.pro/polaris_ranger_570_midsize_manual5t30g.pdfIn PDF document text
    • http://bovavep.iblogger.org/tatitolejasedabe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460447/normal_5fcaf6be81e01.pdfIn PDF document text
    • https://xegazoniwenopuk.weebly.com/uploads/1/3/6/0/136011370/f07a50194e9.pdfIn PDF document text
    • http://return-0.com/wisosotaxgcics.pdfIn PDF document text
    • http://chelamela.org/6917801166j97ad.pdfIn PDF document text
    • http://kyukty68.xyz/star_trek_the_next_generation_season_1_episode_8_dailymotionk655n.pdfIn PDF document text
    • http://vilopeg.xyz/fogosunudadof9574.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sawopigemon.epizy.com/black_s_law_dictionary_9th_edition_apk.pdfIn PDF document text
    • http://xilagerezob.epizy.com/addison_disease_treatment_guidelines.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000132ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132AD 6040 bytes
SHA-256: 47062fdb33d68ed4b2fed571720d576cfb8b2dcbbc56ec48781910cb03f207bf
font_01_sfnt_off00014723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14723 15588 bytes
SHA-256: f7feae23f2a3d6490dad9aa608fe4a85d6b235f37fc11ee9fbbddabfa516b501

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