Malicious PDF — malware analysis report

Static analysis result for SHA-256 f63723a0aec14dd5…

MALICIOUS

PDF

83.8 KB Created: 2021-03-17 03:30:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 863f40a10b0f01ab674ade99ab524433 SHA-1: d4b8c01c64a5f34d39ac64ff96ec760ef0d7ed7e SHA-256: f63723a0aec14dd5a04a251cd5ed4d62715f43f792e9f54ccd3ee17fd77ad777
156 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, specifically identified as a phishing trojan by ClamAV. The PDF contains a large number of external links, forming a link farm, with the primary URL pointing to 'zajinet.ru'. This suggests the document's purpose is to redirect users to a network of sites, likely for malicious purposes such as phishing or distributing further malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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/award?keyword=english+speaking+practice+material+pdf
    • https://vidafipi.weebly.com/uploads/1/3/1/6/131636743/e4fcae3bdcbf9.pdf
    • https://cdn.sqhk.co/petawelesup/9fyidgj/hashtags_to_use_on_instagram_to_get_followers.pdf
    • https://geruzusuvar.weebly.com/uploads/1/3/0/7/130776720/zotiwajapawalepixum.pdf
    • https://buriviniroxino.weebly.com/uploads/1/3/1/6/131606563/lixova.pdf
    • https://kijaxupujik.weebly.com/uploads/1/3/2/6/132695195/sisakatevopojo.pdf
    • https://cdn.sqhk.co/vixawutozama/shjiajc/subway_train_adventure_2016.pdf
    • http://kazoxizodasese.iblogger.org/swift_ios_file_alamofire.pdf
    • https://dufebekeromodi.weebly.com/uploads/1/3/0/7/130776386/6635786.pdf
    • https://cdn.sqhk.co/pejinijew/oyidBjf/44830403154.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://negavutagogo.epizy.com/11867399387.pdf
    • https://s3.amazonaws.com/dibedamoka/bidovagadixusekakin.pdf
    • http://tuxijug.rf.gd/bobby_east_psycho_bae.pdf
    • https://d1ee23ee-9ccf-45b0-80ef-1e1ff1f657c4.filesusr.com/ugd/9ef0c3_fe2538b349d84d718b8963032f8300b5.pdf?index=true
    • https://s3.amazonaws.com/wetowuzuxit/the_sense_of_an_ending_book_club_questions_and_answers.pdf
    • http://xegunapajom.epizy.com/rujaguzeziguwu.pdf
    • https://451b78f8-089e-4d4d-bc4b-60abb621f7e6.filesusr.com/ugd/7ef0dc_9a3501faabd54ee9aa558956ae02f32b.pdf?index=true
    • https://5862e4ea-63a6-4c92-af93-e06d02d1a664.filesusr.com/ugd/eaa371_c88041426068488f891c2415ed1f2405.pdf?index=true
    • https://bd5e8a39-7345-4d1c-b933-e8ec171ec4b0.filesusr.com/ugd/2dab9e_2fe923ffb774410fa03c645f9df82dd1.pdf?index=true
    • https://s3.amazonaws.com/gozifep/android_api_21_date.pdf
    • http://batofudinub.epizy.com/samsung_rf267_ice_maker_reset.pdf
    • http://tufitokinetesez.rf.gd/wadudapodutozijafegikod.pdf
    • https://5e73d190-47a4-4ead-99bf-7e9069f06a16.filesusr.com/ugd/55cc32_8b4832c08cab4a4aab18111a6666446a.pdf?index=true
    • https://s3.amazonaws.com/xugigabitulu/canada_post_international_shipping_customs_form.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_off00010787.bin
8547131f6f31f59df37d7981b2b17030ccb1625226a943031ec73e65e660544e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10787 5592 bytes
font_01_sfnt_off00011a6a.bin
a70579e4abdd9187a391386aa59e883fa9db5221363fb5886a983096afdb06c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A6A 11044 bytes

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