Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa0e79801b4b5a67…

MALICIOUS

PDF

79.3 KB Created: 2021-04-24 17:58:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 706ec2dac2460bcd823c07c23ab52c3d SHA-1: 1837cdc5abec902be629317f18b02c3b05b6e438 SHA-256: aa0e79801b4b5a67ad380b638d7f4ad047392e438b2a6e754786f6a9a01cf845
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 0.9991

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://crophysi.ru/strik?utm_term=computational+fluid+dynamics+pdf+download PDF link annotation
    • https://generixa.weebly.com/uploads/1/3/5/3/135350481/xelesogepovozisiku.pdfIn PDF document text
    • https://cdn.sqhk.co/seseniluvus/rhbXhea/fancy_pants_adventures_world_3_remix_description.pdfIn PDF document text
    • http://ewop.space/how_to_use_the_light_meter41nfx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490936/normal_6026100608f76.pdfIn PDF document text
    • https://cdn.sqhk.co/wazuvegox/kCieMja/methods_in_molecular_virology.pdfIn PDF document text
    • https://cdn.sqhk.co/wigalefu/cqEQVcS/81658787678.pdfIn PDF document text
    • https://doxefifuz.weebly.com/uploads/1/3/0/9/130969363/3784619.pdfIn PDF document text
    • https://dixelopenam.weebly.com/uploads/1/3/4/5/134590152/6723004.pdfIn PDF document text
    • https://cdn.sqhk.co/didatife/HjgQhjg/11464087112.pdfIn PDF document text
    • http://piredvizhnik.com/57944659914x3kam.pdfIn PDF document text
    • http://helps-lnstagramcopyrights-about.com/transformation_voix_active_voix_pass1s5dz.pdfIn PDF document text
    • https://cdn.sqhk.co/sagitusat/Pr8jcoe/moto_camera_2_apk_mirror.pdfIn PDF document text
    • http://top-odejda.com/what_are_the_7_elements_of_a_story_and_their_meaningp3x6u.pdfIn PDF document text
    • https://cdn.sqhk.co/vudararemane/jesVPih/zatosevaxosa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408174/normal_602a7bfaeb622.pdfIn PDF document text
    • http://ulekschool.online/guzifikulakirms40k.pdfIn PDF document text
    • https://cdn.sqhk.co/tumowara/6hbgcJ1/tikulumi.pdfIn PDF document text
    • http://help-mediasupport.com/586873916239c38c.pdfIn PDF document text
    • https://cdn.sqhk.co/xemuxebu/geidPTa/red_button_down_shirt_near_me.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443602/normal_5fd678d68489f.pdfIn PDF document text
    • http://nuveclovet.xyz/new_yorker_magazine_coverdb7v5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450634/normal_5fd95d5b182ee.pdfIn PDF document text
    • http://wiregabjuk.fun/javimogivobimz0gnz.pdfIn PDF document text
    • https://cdn.sqhk.co/nebafaveju/fjee8PV/31294704195.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f4bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BB 5304 bytes
SHA-256: 67d95f2da7ecdb169869a5969ec702e83f0eb07714744cb8614ae7f632a6c40c
font_01_sfnt_off000106ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CE 11256 bytes
SHA-256: fb50d3aace6ca669f25955a18bb5a77c14322c28bd6206c68d5f0c7ffa7522cf

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