Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9898e7536e1611f…

MALICIOUS

PDF

82.5 KB Created: 2021-04-07 16:12:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 8b0be185abbc800039964952f267c1fd SHA-1: da6d77e9ffecfccac8b0ced907b17361a751091d SHA-256: b9898e7536e1611f475f00114e95d13f27151c96d61d863a1ee7d1cd2ccb8fb0
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 0.9998

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://dafemum.ru/strik?utm_term=jack+kerouac+on+the+road+book+cover PDF link annotation
    • https://cdn.sqhk.co/zidezofa/cjcha9z/famodupebunotinokiv.pdfIn PDF document text
    • https://vasigigu.weebly.com/uploads/1/3/4/6/134607878/c09fca7.pdfIn PDF document text
    • https://serudifatu.weebly.com/uploads/1/3/5/3/135324897/jifopaxawuvugonozuno.pdfIn PDF document text
    • https://cdn.sqhk.co/feketukadoz/c5mjejh/23053789591.pdfIn PDF document text
    • https://cdn.sqhk.co/xurajalijok/bibB9Wy/zombie_day6_english_lyrics_and_chords.pdfIn PDF document text
    • https://cdn.sqhk.co/motakolilo/hk9HKja/17800531898.pdfIn PDF document text
    • https://bizutimuja.weebly.com/uploads/1/3/3/9/133999747/sesuki.pdfIn PDF document text
    • https://kerixagagunusuz.weebly.com/uploads/1/3/0/7/130776265/a3f00c3cdd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0386e8b-4493-4507-9175-686b1c771215/paligoven.pdfIn PDF document text
    • https://s3.amazonaws.com/wobuzisibal/35457185752.pdfIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/salajazesixavagu.pdfIn PDF document text
    • https://s3.amazonaws.com/rodigapigeta/mabam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d87b57e-67b9-4c2c-8662-3353dd1b8e49/what_does_the_term_curriculum_compacting_represent.pdfIn PDF document text
    • https://1afae0f6-9e35-4dc9-9db7-5dbf78511926.filesusr.com/ugd/afe78f_ceb0c3389e734166801d9c5a361ea56e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/111842cf-a58e-4e95-b6ab-89109437a545/persuasive_writing_topics_for_grade_8.pdfIn PDF document text
    • https://dc5983eb-04eb-4341-be6e-5f763cf8c8d0.filesusr.com/ugd/979c04_ee6246c88d884fab864d6ab6cdb2c6c9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/badodemebo/the_media_monopoly.pdfIn PDF document text
    • https://s3.amazonaws.com/wumodukubaru/jinatobopemorozikimow.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE92 5072 bytes
SHA-256: 51949a5e2ee4ac6caf957e74c87966d237248a819bb07381a7f758ac0059c4d5
font_01_sfnt_off0000ffd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD1 11592 bytes
SHA-256: 1eeffa75b8026962b33000cd38ec1767326ad55c65a2c8ed79d3812781d713ba
font_02_sfnt_off000126fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126FA 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e

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