Malicious PDF — malware analysis report

Static analysis result for SHA-256 b85ae40c31180059…

MALICIOUS

PDF

82.8 KB Created: 2021-01-18 11:52:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: fa3036ab6ef745a9fac0f47155641840 SHA-1: 7de9857bd177bffff8137a8c64e09009015fb491 SHA-256: b85ae40c311800597da3fcda03bb6702c3cfdde7d1eab966fd18a66c9a964cd7
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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 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.
  • 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://bologen.ru/123?utm_term=role+play+costumes+for+him PDF link annotation
    • https://kaperimivegorew.weebly.com/uploads/1/3/4/3/134371305/9086005.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428039/normal_5fbbe8bfa4c02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474231/normal_5fbd81b8a44fb.pdfIn PDF document text
    • https://cdn.sqhk.co/dajusonas/heYhfdy/15615740234.pdfIn PDF document text
    • https://vowebaxuzifov.weebly.com/uploads/1/3/0/7/130738870/7272495.pdfIn PDF document text
    • https://site-1177349.mozfiles.com/files/1177349/rugefimujefuma.pdfIn PDF document text
    • https://site-1195473.mozfiles.com/files/1195473/mcdonald_s_menu_specials.pdfIn PDF document text
    • https://wodedofa.weebly.com/uploads/1/3/4/3/134320626/964550.pdfIn PDF document text
    • https://kagebavewijove.weebly.com/uploads/1/3/0/7/130740568/51380bec317ff8.pdfIn PDF document text
    • https://cdn.sqhk.co/kadeposamo/6IXgihd/60647343515.pdfIn PDF document text
    • https://site-1213673.mozfiles.com/files/1213673/asymptotic_behavior_answer_key.pdfIn PDF document text
    • https://site-1188839.mozfiles.com/files/1188839/airport_near_atlantic_city.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425005/normal_5fb5a28abb9f8.pdfIn PDF document text
    • https://cdn.sqhk.co/jufebarur/xm9yMhb/sesaredomo.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://s3.amazonaws.com/gezejoputiwinu/82986306660.pdfIn PDF document text
    • https://s3.amazonaws.com/dowavelaxam/curriculum_map_template_math.pdfIn PDF document text
    • https://s3.amazonaws.com/bodajaku/77902475434.pdfIn PDF document text
    • https://s3.amazonaws.com/jivala/bubble_bobble_2_game.pdfIn PDF document text
    • https://s3.amazonaws.com/levumoduf/transformer_voltage_regulator_avr.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F6 5140 bytes
SHA-256: 19b55ad22b7c250eeaf5eac31ad82d902b98ea10b20f71b20ec24bc21283fe4a
font_01_sfnt_off00010982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10982 11464 bytes
SHA-256: 93138d78489a3f4f425d19fb0469dd378e9eab9075f78d6ff2f413c23c7a21f8
font_02_sfnt_off00013044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13044 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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