Malicious PDF — malware analysis report

Static analysis result for SHA-256 bced4140f23c53af…

MALICIOUS

PDF

90.1 KB Created: 2021-03-29 06:51:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: d9fd510d7b9c74f78833b1818833ce00 SHA-1: e7fc63b6a75a56838184595539dc16ef2bef9f94 SHA-256: bced4140f23c53affd0c46dee6466e4279dcd46380138502e5a7df7f339f01c3
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm PDF. It contains numerous embedded URLs pointing to potentially malicious domains, suggesting an attempt to redirect users to phishing sites or download further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates a malicious intent to distribute links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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://baarspo.ru/strik?utm_term=snow+whitening+kit+byte PDF link annotation
    • https://damemebu.weebly.com/uploads/1/3/5/3/135316778/zezimapojeva.pdfIn PDF document text
    • http://majovevalaji.sportsontheweb.net/sinuro.pdfIn PDF document text
    • https://cdn.sqhk.co/vusutesilo/hfAghdC/airplane_crash_dreams_interpretation.pdfIn PDF document text
    • https://fifitedogij.weebly.com/uploads/1/3/4/7/134747960/2ca534208.pdfIn PDF document text
    • https://cdn.sqhk.co/zikufivol/ihhhjfV/rubimepigovajalapejafeva.pdfIn PDF document text
    • http://gexomafe.mypressonline.com/vizio_sb3820-c6_38-inch_2.0_channel_soundbar_review.pdfIn PDF document text
    • https://cdn.sqhk.co/gumakulex/gLRiahd/journeys_interactive_series.pdfIn PDF document text
    • http://mojenisijita.mywebcommunity.org/calculus_10e_textbook_online.pdfIn PDF document text
    • https://jasezanita.weebly.com/uploads/1/3/1/6/131637239/053db45adbf.pdfIn PDF document text
    • http://fudoviwil.mywebcommunity.org/bsc_1st_year_zoology_notes_2020.pdfIn PDF document text
    • http://fasumidivojasuj.iblogger.org/prepositions_with_nouns_adjectives_and_verbs_list.pdfIn PDF document text
    • https://bipuwuvi.weebly.com/uploads/1/3/0/7/130776795/xevalajip.pdfIn PDF document text
    • http://lewemegipagolaw.iblogger.org/how_to_pair_delphi_bluetooth.pdfIn PDF document text
    • http://zifixoribe.scienceontheweb.net/jinogar.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/wuwabobujasivor/grade_10_english_book.pdfIn PDF document text
    • http://dedufaga.rf.gd/calfresh_eligibility_status_report.pdfIn PDF document text
    • https://s3.amazonaws.com/sobaketemu/kebepuxavejevufumomek.pdfIn PDF document text
    • http://metusajixano.epizy.com/best_behringer_mixer.pdfIn PDF document text
    • http://xatamiv.rf.gd/84595753848.pdfIn PDF document text
    • https://s3.amazonaws.com/kewakuko/polycom_vvx_410_phone_warning_icon.pdfIn PDF document text
    • https://58eafb2e-ea74-4523-a1b2-d2e0fe9bfe54.filesusr.com/ugd/466fa0_79b0f23e05cb4d81a32503ee8bcc2bd5.pdf?index=trueIn PDF document text
    • https://8e12fe21-47c1-448c-af9e-883e7c84523b.filesusr.com/ugd/52ac5e_ca07509b5b8e47638c163ef687afc0ea.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_off00012212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12212 4932 bytes
SHA-256: fe1f52b6e7b58a299d8b40cc262534de4c4e2c5d97e5516cb3e6f6763f5a718b
font_01_sfnt_off000132fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132FE 11704 bytes
SHA-256: f6484b4ebd4494394077225bae0ce98728b9e329a6d8dc805eae55dca1ade03b

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