Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dac35ab0c3b7d88…

MALICIOUS

PDF

85.8 KB Created: 2021-03-24 03:19:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5c510c160b73cc657f1b9b2864d8b193 SHA-1: 2a108697c950fb7173793d2b97907fef31df1f95 SHA-256: 6dac35ab0c3b7d88e04c73cb364e4e7cc0163a2bd9940fbe94de8c267d2ab741
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious or SEO-spam domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV also flagged this PDF as malicious, suggesting a phishing or trojan distribution attempt. The embedded URLs likely serve as a lure to download further malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://resalured.ru/strik?utm_term=what+is+unravel+two+about
    • https://memetunariva.weebly.com/uploads/1/3/1/4/131454345/fadipap.pdf
    • http://lizuzezusad.medianewsonline.com/christmas_choir_music.pdf
    • http://siviveko.getenjoyment.net/zajapaza.pdf
    • https://mabosuvix.weebly.com/uploads/1/3/4/8/134851695/3672902.pdf
    • http://jetavimazi.22web.org/fobia_social_tratamiento_cognitivo_conductual.pdf
    • https://reforolirif.weebly.com/uploads/1/3/4/8/134885236/79ea1430b303f.pdf
    • https://kezaguwubov.weebly.com/uploads/1/3/4/6/134632481/verolixefeki_josobamakepaji_dorulorilidaf_gesokak.pdf
    • https://fopokefizig.weebly.com/uploads/1/3/4/5/134525302/nixero-botitovixukod-tojan.pdf
    • https://vetazewufa.weebly.com/uploads/1/3/2/8/132814418/2709122.pdf
    • https://kuvukodu.weebly.com/uploads/1/3/1/4/131453249/kekugute-jegilufol-vojavafuxe.pdf
    • https://liletalezawo.weebly.com/uploads/1/3/4/5/134591830/rokamaza.pdf
    • https://tejenopaje.weebly.com/uploads/1/3/1/1/131164027/nusuzudaxegaz_zetositoruwu_lufuvuje.pdf
    • https://vamawawu.weebly.com/uploads/1/3/0/8/130874524/madejaxa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/63feb586-c7dd-4c51-bfda-b322d3eff120/what_happens_in_the_fourth_divergent_book.pdf
    • http://vebavibokifoko.epizy.com/tilawite.pdf
    • https://81da36f4-dec6-4bf4-836b-19ed67500659.filesusr.com/ugd/5fd5c1_e731f4275d124cd19426bcec212be2fb.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7e97dc98-aae1-408e-967a-ad21a73d36a7/43107052669.pdf
    • https://e5baaea7-7007-41de-9367-4ebf3ed55875.filesusr.com/ugd/8e1900_6364746ee91f4fe0abec878de1bd857e.pdf?index=true
    • http://fuxunowelujuxa.atwebpages.com/lighting_busbar_trunking_system.pdf
    • https://74fc1a11-d445-4ffb-bc6b-7a79e5a65a18.filesusr.com/ugd/097bd5_83a39fae3eb04a96a830b309262043e1.pdf?index=true
    • https://2d130471-2a64-48ba-87cf-8f1e86c6acad.filesusr.com/ugd/9c43ec_7377d2bf08754319945b952648746f42.pdf?index=true
    • https://uploads.strikinglycdn.com/files/44debce8-aa58-4ff1-a9bf-c916b73d3d82/oracle_sql_concat_2_columns.pdf
    • https://uploads.strikinglycdn.com/files/2443f882-af3f-4e99-abf7-e69f620352d8/gewilufuseredow.pdf
    • https://uploads.strikinglycdn.com/files/09d6ec66-f817-4f60-9d7f-a98587aec6f1/financial_calculator_ba_ii_plus_texas_instruments.pdf
    • http://pemuvem.epizy.com/what_is_considered_middle_class_income_in_ontario.pdf
    • https://38aad9b5-7a72-45b8-ac81-9fe73ce82000.filesusr.com/ugd/08338c_6edd3fa24a55469981059ec94a08656d.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103c0.bin
4240d99e663dab563d7d9c0f65a5b26950fd26b1018cd9b7a89894c4edae8ae3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103C0 4960 bytes
font_01_sfnt_off000114a7.bin
dacae62c31ab762269fbce2d16f8b8a19f93082faf25f8450ce3e060179bba39		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114A7 11324 bytes
font_02_sfnt_off00013b43.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13B43 4324 bytes

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