Malicious PDF — malware analysis report

Static analysis result for SHA-256 deec77b9a998e2c5…

MALICIOUS

PDF

77.6 KB Created: 2021-03-14 21:07:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b5d9ebe2b591e1bafe34d41c4c49644 SHA-1: 1ae70f8172b560a6bda0997af729f6ae0518bb7a SHA-256: deec77b9a998e2c5acdd1a344c49d4b140eb5601b9d7e02be66bfe14a5a3e392
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The PDF file was flagged by multiple heuristics, including PDF_SEO_LINK_FARM and ML_NYX_PDF_MALICIOUS, indicating a high likelihood of malicious intent. The file contains a large number of external links, suggesting it is part of a link farm or phishing campaign designed to redirect users to malicious websites. The ClamAV detection further supports its malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/wix?keyword=the+complete+interview+answer+guide+pdf+download
    • https://posesisex.weebly.com/uploads/1/3/5/3/135332701/315efc.pdf
    • http://remontlegko.info/kotowepawoxircqba.pdf
    • https://tunizobun.weebly.com/uploads/1/3/1/0/131069832/347a5b3783e7.pdf
    • http://masito.space/how_to_do_sat_math_fasterslh6r.pdf
    • https://mizugoveram.weebly.com/uploads/1/3/3/9/133986338/d982d726f988d.pdf
    • https://bituxusod.weebly.com/uploads/1/3/4/3/134347303/5731468.pdf
    • http://sallehq.xyz/electrical_theory_for_dummies9fnbf.pdf
    • http://marketitaly.pro/how_can_i_download_oxford_dictionary_offlinezm3et.pdf
    • https://kanunobak.weebly.com/uploads/1/3/1/0/131070574/gunuzepolula_zoridi.pdf
    • http://uuuuull.space/sonicwall_tz_205_manual2raak.pdf
    • http://item-mask.top/collage_maker_for_computer_downloady40ra.pdf
    • https://wabatopopelak.weebly.com/uploads/1/3/0/7/130775953/6633854.pdf
    • https://ragurukenawuxif.weebly.com/uploads/1/3/4/6/134667210/7247220.pdf
    • https://matazesugol.weebly.com/uploads/1/3/4/7/134702103/8938874.pdf
    • https://zemapefim.weebly.com/uploads/1/3/4/4/134485651/4941564.pdf
    • http://rekilafemet.iblogger.org/john_maxwell_books_on_leadership.pdf
    • https://motadonikedubi.weebly.com/uploads/1/3/1/8/131856170/5046633.pdf
    • http://b0xberry.online/vebofdua42.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://dogamesesokuj.rf.gd/cat_mario_online.pdf
    • https://s3.amazonaws.com/kakef/53748872549.pdf
    • http://kapekoguxepo.rf.gd/alien_shooter_2_mod_android_1.pdf
    • http://votokigifa.epizy.com/86396741597.pdf
    • http://lojuvep.epizy.com/96061007023.pdf
    • https://s3.amazonaws.com/setikizo/2756362051.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_off0000f198.bin
7d94d2fcf705d855b2171c42abf32cc54aeff609d10daafa587b8b610057714d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF198 5668 bytes
font_01_sfnt_off000104c8.bin
29921c08fe263c6bca8ffc767f966ce81af8ab39fc1c0a6e9654247f7e57795c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104C8 10780 bytes

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