Malicious PDF — malware analysis report

Static analysis result for SHA-256 c93bbdc19160370b…

MALICIOUS

PDF

64.1 KB Created: 2021-03-11 16:39:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef4f278fdd9a8ec04d29eabeab255ff5 SHA-1: 7995d2dda89a38d347f76aad617b2c33e6b71591 SHA-256: c93bbdc19160370bc1cc63fe6945149880d4f69427cb4e1f363f4126776de53e
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains like weebly.com, indicating a link farm designed to redirect users. The presence of a URL containing 'sticker creator apk uptodown' suggests a lure to download potentially malicious software. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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.
  • 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://golowaki.ru/123?utm_term=sticker+creator+apk+uptodown
    • https://wanesutilujat.weebly.com/uploads/1/3/4/8/134868149/demunela-tufeperek-lusefe.pdf
    • https://xesukalo.weebly.com/uploads/1/3/5/3/135311970/f867274.pdf
    • http://oyuncuxx.com/36016644372gi36v.pdf
    • http://vk-settings-change.online/vijikiluxogzmbqp.pdf
    • http://usesucre.pro/science_without_religion_is_lame_meaning_in_telugusuvci.pdf
    • https://buluzuzumaz.weebly.com/uploads/1/3/1/6/131636727/fegutobetirasefate.pdf
    • https://xazepobuzu.weebly.com/uploads/1/3/4/5/134582826/bipogur.pdf
    • http://makeyourself.xyz/97184234715zibq9.pdf
    • https://kiriwalukejogof.weebly.com/uploads/1/3/4/3/134310578/3bdfbd8c.pdf
    • http://kurs1.xyz/search_bar_missing_google_chromeot5sd.pdf
    • https://kosopewoxi.weebly.com/uploads/1/3/5/3/135318270/bijizominetu_ratapope_pomametojabusi.pdf
    • http://copyrighthelpptteam.com/kamowofarujafobupinekpq3t2.pdf
    • https://lepifokofufup.weebly.com/uploads/1/3/4/0/134018260/b339e4bb096.pdf
    • https://zozilevijuni.weebly.com/uploads/1/3/1/3/131383476/kobuj.pdf
    • http://robinmani.site/sikusevagisakukic6oix.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/6cae7677-5203-4985-acf4-c23c6289008d/fishermans_ultimate_knot_guide.pdf
    • https://uploads.strikinglycdn.com/files/ecb43827-b36d-4a88-8645-b2f7b500dd3d/solid_state_physics_textbook.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c125.bin
0ddb1d4ec24e2dd23c824765f5a7783703bf23562eacbeccf536a69bc045a7f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC125 5116 bytes
font_01_sfnt_off0000d2b3.bin
7c7ab9010e1c08735c7d4b26cbbcb7f94041656174835222ac4e5be81bfd4f85		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B3 9680 bytes

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