Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1e7f82739b6701d…

MALICIOUS

PDF

77.9 KB Created: 2021-05-14 23:44:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d2c7e5f0356c81db56a77e608de2296b SHA-1: 753e87aa47bd3b3772516489042a9f3cf4bc4e5e SHA-256: b1e7f82739b6701dca19352064e710408ab8f69331f79177abd5c5a472d260f3
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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 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.
  • 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://xajibur.ru/strik?utm_term=how+long+does+it+take+to+make+deer+jerky+in+dehydrator PDF link annotation
    • https://xomuwesakutizid.weebly.com/uploads/1/3/5/3/135393414/tupofinugu.pdfIn PDF document text
    • http://feelslike35.com/54055317078crqfs.pdfIn PDF document text
    • http://rafale.store/jujumakanezijifajifekomiktgxj.pdfIn PDF document text
    • http://creamwalls.online/hard_reset_samsung_tab_ce0168dkh51.pdfIn PDF document text
    • https://venozosuvizulul.weebly.com/uploads/1/3/0/8/130814909/somepagalewal_daderexobodu_kupogogu_fusefodidajim.pdfIn PDF document text
    • https://xidibifolun.weebly.com/uploads/1/3/2/7/132710634/zibuwani_fimetokovoze.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/godewumazek/wellcare_medication_prior_authorization_form_illinois.pdfIn PDF document text
    • http://dovitunazimaze.epizy.com/79038022829.pdfIn PDF document text
    • http://zizolim.rf.gd/chuck_palahniuk_choke.pdfIn PDF document text
    • https://63dbeab4-18c6-4677-a808-17cd77aec119.filesusr.com/ugd/963d80_c4f1d66bd99841839317a46443b930b3.pdf?index=trueIn PDF document text
    • https://d429d46a-6203-486b-8c9d-ede5597e1383.filesusr.com/ugd/419b00_a0ddc2946a9f4f48a91a895c7e79896a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/23210599138.pdfIn PDF document text
    • https://s3.amazonaws.com/poresi/potejapiv.pdfIn PDF document text
    • http://tefotifomasun.epizy.com/xunogore.pdfIn PDF document text
    • https://s3.amazonaws.com/woneketelak/ievan_polkka_sheet_music_flute.pdfIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/what_to_do_if_my_polaroid_tv_wont_turn_on.pdfIn PDF document text
    • https://s3.amazonaws.com/webipejonavuv/challenge_war_of_the_worlds_2_episode_10.pdfIn PDF document text
    • https://s3.amazonaws.com/venunamazozuzo/the_working_poor_invisible_in_america_chapter_1_summary.pdfIn PDF document text
    • https://fa53e508-d88d-41cb-897c-7a5b6f1bfcc3.filesusr.com/ugd/361045_85fdce0dc5ed41c88d998db074fdedf1.pdf?index=trueIn 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_off0000f0ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AC 5536 bytes
SHA-256: d48b93b7e06effb08a80627b444a6d6008d2bc1d007ef4dd7a1f408c248458fe
font_01_sfnt_off0001036a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036A 11292 bytes
SHA-256: c1c919f2c3f0dfd255420a4cfdfffad71a04cb948ac94ed7f3f15247075ed6cf

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