Malicious PDF — malware analysis report

Static analysis result for SHA-256 cac19a57778e7f92…

MALICIOUS

PDF

77.2 KB Created: 2021-04-02 05:45:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: a314fe680b7e7afc0bf9d82f17a34311 SHA-1: 10ae725e8e3573e8a26aba756bb07f65dafc57e5 SHA-256: cac19a57778e7f924731c396002d389c2c72ed0910d310a8b1d5b3d846fab979
186 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 0.9996

Heuristics 6

  • 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 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.
  • 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://gimoguvi.ru/strik?utm_term=dirt+bike+helmets+stores+near+me PDF link annotation
    • http://znakomstva18x.site/dofozipuuh32f.pdfIn PDF document text
    • http://6gusevshop.space/873051280831iwn2.pdfIn PDF document text
    • http://spiritstudio.ru/honeywell_barcode_scanner_manual089z5.pdfIn PDF document text
    • https://sixebujexe.weebly.com/uploads/1/3/0/7/130740217/vanadozakinavemotasa.pdfIn PDF document text
    • https://dasajusowerav.weebly.com/uploads/1/3/1/6/131637273/f653fd.pdfIn PDF document text
    • https://renokogepebamon.weebly.com/uploads/1/3/2/6/132696434/tabizebamuradukuga.pdfIn PDF document text
    • http://detonic-italy.website/possessive_pronouns_worksheet_grade_10dj5q.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bomumude.epizy.com/bible_esv_version.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d152b222-93fe-408d-a246-7667e4e8ec0e/honda_radio_code_error_3.pdfIn PDF document text
    • https://e590c0d9-b694-44fb-9862-47327b30d8b0.filesusr.com/ugd/89363e_e45523d52ffb493baea22498e0b6cfff.pdf?index=trueIn PDF document text
    • http://lamumabazekutum.epizy.com/41844771968.pdfIn PDF document text
    • https://99b08629-27b2-41dd-83a1-938dc2ca35bd.filesusr.com/ugd/067ecb_4ef20186bdae49f291032422d09e97bf.pdf?index=trueIn PDF document text
    • http://gogewarixisude.epizy.com/84629961137.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdd96b73-58ec-43ff-904b-441bb5bf3a4d/high_protein_low_carb_vegetarian_breakfast_recipes.pdfIn PDF document text
    • https://e082b6be-64c0-45f6-a8ff-82b9c6f476f0.filesusr.com/ugd/1479de_81c0421497404ac398d39eba033bcc19.pdf?index=trueIn PDF document text
    • http://kejufunekopal.epizy.com/56654298993.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1cb4086-e3f6-44f4-8dcc-4371e776b37d/best_codes_for_anime_fighting_simulator_2020.pdfIn PDF document text
    • https://1c985592-4fe2-425a-b8d2-7dc24782370c.filesusr.com/ugd/a13bc2_a32c5beb7fa84415ae2b58f31d4895e2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0aeb7774-ca9f-4469-8dee-a79491cf3778/19084423648.pdfIn PDF document text
    • https://9fd063f5-a6e2-47f0-a1c8-15c646e36cc9.filesusr.com/ugd/ee11ea_1a8a3494250843ecbcc417a87c370b4a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d398f82-7608-4a39-806e-9ccaa07e2869/if_clause_type_1_worksheet_printable.pdfIn PDF document text
    • http://kexepujufe.rf.gd/action_research_kurt_lewin.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_off0000f1a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A1 5128 bytes
SHA-256: 7c973ce8dbcb24799043d66bf2943961a32d6e1c26330de68dacc74d97fdbd10
font_01_sfnt_off000102e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E5 10832 bytes
SHA-256: 2c4296adccd7030ce3dfd161487d07f81d8635781696aa3ebd7bfd84490ba615