Malicious PDF — malware analysis report

Static analysis result for SHA-256 61d270696fdbb139…

MALICIOUS

PDF

125.7 KB Created: 2021-03-20 21:06:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: bb16ea04010e46b10e390542f9c5013f SHA-1: af33ec2bbfcfa294b441f7bfc21ea83e14a598cf SHA-256: 61d270696fdbb13986ced0a5c979dc855e2eac0f4efc5b02c25368f6100c486c
186 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 0.9997

Heuristics 6

  • 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.
  • 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://vilenefex.ru/award?keyword=berber+language+in+algeria+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4464056/normal_5fdba2457b1c8.pdfIn PDF document text
    • https://cdn.sqhk.co/kuxixixixi/hjgjgij/63747485904.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382627/normal_60232bbcea33a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422914/normal_603ce9f60e6bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465125/normal_60494f239b624.pdfIn PDF document text
    • https://cdn.sqhk.co/ketegobuto/aj9OihU/93750215458.pdfIn PDF document text
    • http://topsale.pro/mojogugemizaciiyr.pdfIn PDF document text
    • http://srakan.space/fumovenodabikagonepr1iwj.pdfIn PDF document text
    • http://artrosil.xyz/gewabeq0m9n.pdfIn PDF document text
    • https://cdn.sqhk.co/pujixefan/hfje0jg/zojuzowapevidot.pdfIn PDF document text
    • http://saudiautoinsurance.com/mainstays_tv_stand_assembly_instructionsl0v60.pdfIn PDF document text
    • http://peludofnor.fun/2008_jeep_liberty_user_manualqubxq.pdfIn PDF document text
    • http://merovew.xyz/derivation_of_ellipse_equation7h7z7.pdfIn PDF document text
    • http://bigowet.xyz/lawarebulofejejal6nafy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420927/normal_601b2ebe75560.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380867/normal_60262cf877d74.pdfIn PDF document text
    • https://cdn.sqhk.co/wubukuxivupe/iiaghjj/doomsday_caught_on_camera.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369512/normal_5febd2050e12f.pdfIn PDF document text
    • http://podcard2020.site/65283460922cdbcb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5f8b0e40-2141-4341-98ab-6145db4b8156.filesusr.com/ugd/2072cd_2ae7f1314cc04d1abe7985dc4b229afe.pdf?index=trueIn PDF document text
    • https://7c5e2310-e79b-429e-9f4a-70471a43dcce.filesusr.com/ugd/8ec1ef_f65f858b62784c0d83f485a55de76570.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001873a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1873A 5220 bytes
SHA-256: 3e5377c9969269af4ab717c3dad513a6bc855c0058d7e00a016001c06f4110c1
font_01_sfnt_off0001990a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1990A 18280 bytes
SHA-256: 96cc5308fc15b1cbea8b8df639623ba64d887fe24aed34cc909d2bbdbc5e9f32
font_02_sfnt_off0001cf15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CF15 16876 bytes
SHA-256: d4d6802f7ac5e36b182a2db70935fd7edb39098286a49792fda7a6cd64799047

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