Malicious PDF — malware analysis report

Static analysis result for SHA-256 889a36a6c87a1542…

MALICIOUS

PDF

74.6 KB Created: 2021-02-09 05:01:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: b745c961e612f85e732dd26403b01f0c SHA-1: b281bf1f548f44d6bc27296b85224b27cd109e30 SHA-256: 889a36a6c87a1542330e89614a0c4b4173b361bfb4bedd5e086631cc43f33562
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection scheme. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'Qt', indicating its generation method, and the primary lure appears to be 'Distributive property algebra worksheet pdf'. The numerous external URLs are the primary indicators of malicious intent, likely leading to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • 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 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.
  • 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://bologen.ru/aws?utm_term=distributive+property+algebra+worksheet+pdf PDF link annotation
    • https://gutamunimidujad.weebly.com/uploads/1/3/4/6/134667749/bolexagimegabudul.pdfIn PDF document text
    • http://serunowatavad.iblogger.org/73336575250.pdfIn PDF document text
    • https://sekilulijafos.weebly.com/uploads/1/3/1/4/131438177/784dc7f.pdfIn PDF document text
    • https://bizavewes.weebly.com/uploads/1/3/5/3/135323934/remod.pdfIn PDF document text
    • https://zuzesewijolane.weebly.com/uploads/1/3/1/4/131406438/a2d86.pdfIn PDF document text
    • https://wujawosekeg.weebly.com/uploads/1/3/4/7/134712458/limub_wofewexog_nudamediboro.pdfIn PDF document text
    • https://lefilima.weebly.com/uploads/1/3/0/7/130775934/rafejopotogugawala.pdfIn PDF document text
    • https://bokakarepexopo.weebly.com/uploads/1/3/4/7/134750167/fupivanulewakikizuwi.pdfIn PDF document text
    • https://rafopovuweke.weebly.com/uploads/1/3/2/7/132740485/neviduxoxiko-sixud-zinikigamutod.pdfIn PDF document text
    • https://sofifego.weebly.com/uploads/1/3/4/8/134899758/tinikoluwif.pdfIn PDF document text
    • https://cdn.sqhk.co/pazakazagoz/git3Iid/rilotavefe.pdfIn PDF document text
    • https://cdn.sqhk.co/mekaxosur/he3idOe/free_bass_booster_apps_for_pc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501229/normal_5fcd092e764d5.pdfIn PDF document text
    • http://pubomoxagu.22web.org/devas.pdfIn PDF document text
    • https://divuvefa.weebly.com/uploads/1/3/4/7/134759037/zezofuz.pdfIn PDF document text
    • https://cdn.sqhk.co/daxegajok/hdhgj2B/dress_up_games_free_download_for_windows_7.pdfIn PDF document text
    • https://tabetigilazewa.weebly.com/uploads/1/3/5/3/135392987/77299f900a11ba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://betixaneja.rf.gd/gimozoviwusuvigideza.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_off0000e395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE395 5760 bytes
SHA-256: 5740c6ef7a77442037399fe26b5cb552285b64af9eb2aa296bacd820d42510c2
font_01_sfnt_off0000f745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF745 11164 bytes
SHA-256: 861c677d389b0de3972ead8afa6056fb744108d3c6e50c1fd7671e9f3fc220b5

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