Malicious PDF — malware analysis report

Static analysis result for SHA-256 67ea7a6224b84a87…

MALICIOUS

PDF

77.6 KB Created: 2021-04-25 17:41:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a5c29807e1b3fb096534d1ed072bde02 SHA-1: a9c96ac0cb06f6cabac6bcbaeb157305510dae07 SHA-256: 67ea7a6224b84a8740584dc2d3e8a474f71d486955ca1bacd8aa0b0b53b04391
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9993

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 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://jacksth.ru/strik?utm_term=steins+gate+darling+routes PDF link annotation
    • http://nuzupamumobal.22web.org/bonum_est_confidere_partition.pdfIn PDF document text
    • http://nujinedopidil.iblogger.org/addie_model_worksheet.pdfIn PDF document text
    • http://vukepomekavedi.22web.org/75494218831.pdfIn PDF document text
    • http://pojegan.22web.org/aluminium_composite_panel_manufacturing_process.pdfIn PDF document text
    • http://kevogam.22web.org/nakulofovutokol.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369323/normal_6007c74049d57.pdfIn PDF document text
    • http://firavowinoza.iblogger.org/bourbaki_algebra_1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495551/normal_5feb854f1022c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f39bbd87-5e6a-4dff-920b-279fe5a24832/jump_force_character_pass_2_character_release_dates.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c7aebc9-fc55-43d4-b8d2-ef830c73bf1b/how_to.cite_an_article.pdfIn PDF document text
    • http://sajojuwew.rf.gd/bejomabutetafodugama.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3854acbb-79ec-4ede-bd96-8ec43f500af5/30761292622.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6054038a-00ff-432e-9215-cfb5a13d1c1d/94780856735.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3575fff8-cb88-4bd6-bd76-dd3bd4c55068/what_up_doe_slang_meaning.pdfIn PDF document text
    • https://s3.amazonaws.com/wavunot/iata_dangerous_goods_regulations_table_2.3_a.pdfIn PDF document text
    • https://s3.amazonaws.com/lomuper/akkada_ammayi_ikkada_abbayi_songs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/diwitapezu/lazina.pdfIn PDF document text
    • https://s3.amazonaws.com/wikurixobelu/50204721944.pdfIn PDF document text
    • http://xupizoxodigumir.rf.gd/lomid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95d94eb7-715f-4c50-bc84-f2c1ad42bc91/vermont_castings_defiant_1945.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fababe9-c08f-4b6a-af12-2dd2489000ac/network_guide_to_networks.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46d8e8d8-2f43-4676-9b47-d5d57df25d4f/is_the_nook_bnrv300_still_supported.pdfIn PDF document text
    • http://japaduvovudaku.rf.gd/gewosuvewajadumelagab.pdfIn 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_off0000f1c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C2 5096 bytes
SHA-256: 2b70543b831e278c48eb22d00ffd18be0da2833552e8d3fd48feb6e79e64e4dd
font_01_sfnt_off0001031e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031E 10680 bytes
SHA-256: 016a4d50c76170867354cf8788e4290b86c9ccba772f759ff4914834525b0a70

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