Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7036b06ff7c784c…

MALICIOUS

PDF

81.5 KB Created: 2021-06-09 05:11:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 07b99156bf9692539aaeddd908ed54a5 SHA-1: c455221187ac0d28471e6b1e23fe470f4053072d SHA-256: b7036b06ff7c784c80e5f1dd20f90919d3b1c207d3cca92dfae6e9f5f41fd4a3
126 Risk Score

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-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://ketchas.ru/pbw?utm_term=singular+and+plural+sentences+exercises PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379615/normal_604a447d3223e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415930/normal_5fc737931c220.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390374/normal_60241b6a1332b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472495/normal_600d659567ccf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450356/normal_5fdbbd1a43615.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417526/normal_5fdd952e38cb2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/4e0d5146-69f6-4b6e-ae85-a2e8838eeadd/raven_cruizer_ii_price.pdfIn PDF document text
    • http://lekipirunezi.pbworks.com/f/can_you_have_a_venmo_account_without_a_phone_number.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c5092ba-bd45-48cf-b672-975f5ad75ea1/2015_washington_redskins_cheerleaders_roster.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68561be5-6126-4c5b-8f17-6601e15ce51e/bamukokuwokiliba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6b25b7f-0958-485b-b5e1-56a462b535ab/33349585312.pdfIn PDF document text
    • http://dakenesemi.pbworks.com/w/file/fetch/144914565/dudovif.pdfIn PDF document text
    • http://jesababa.pbworks.com/f/tasabugitumenitonalulata.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0100e17-3aea-4699-8e3c-5817e96be9b6/buruvulitovirofiramus.pdfIn PDF document text
    • http://mujefefimuf.pbworks.com/f/narcissistic_personality_disorder_symptoms_list.pdfIn PDF document text
    • http://veniwusuj.pbworks.com/w/file/fetch/144488169/.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bcfa4c1-14eb-4f27-8e52-1ededb683c36/47173157458.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4681115-b554-48ad-b45c-0bcaf1d983c2/libro_gratis_las_7_claves_del_exito_de_disney.pdfIn PDF document text
    • http://likanegi.pbworks.com/w/file/fetch/144490542/fotipu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e0e4c41-734f-41c8-ba1e-0d848c609bfe/gezopoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cde0701-f4b4-4be8-b95e-a854e626dc9f/86737271682.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3F 5184 bytes
SHA-256: fd2ec4626a9da67b5e71c6881703776fe57c8de6d4a18de234a9652932f71710
font_01_sfnt_off0000ebe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE7 9744 bytes
SHA-256: f3c190cffcb1ba8185c9d52b67a164fc5bdbb1e685cd23873874cecdbddb5b68
font_02_sfnt_off00010d6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6D 18252 bytes
SHA-256: 2df07c7884ea8467651146dd3a97d6535ef1a120df56bc237bcd366ee74bbd3e
font_03_sfnt_off000129a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129A0 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361