Malicious PDF — malware analysis report

Static analysis result for SHA-256 d251df54501cc7d3…

MALICIOUS

PDF

77.8 KB Created: 2021-03-18 17:28:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ddd3a0418c5152ad9c2a2236e729694f SHA-1: a3f3c38a2a330e4100474a4791d21775ee616fbf SHA-256: d251df54501cc7d38694178d414f8d94ff8a91d2fc5116731d6910e408683d67
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains heuristics indicating it is a malicious phishing document and hosts a large number of external links, many of which are SEO-focused. One of the primary URLs, 'https://resalured.ru/strik?utm_term=what+is+the+best+exercise+equipment+to+have+at+home', appears to be a lure for users searching for exercise equipment. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/strik?utm_term=what+is+the+best+exercise+equipment+to+have+at+home
    • http://begdas.fun/15841954419mecq5.pdf
    • http://dommasters.site/wisamozakewudibasens2a.pdf
    • http://grizhoff.ru/what_do_wine_represent_in_the_bible2xbz4.pdf
    • http://gejesixave.scienceontheweb.net/miremofuvukadi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cff07a16-13b2-455b-8a78-148a75b158b4.filesusr.com/ugd/cda0c7_ef00b63d97b04bbf9b87adbc3ee69029.pdf?index=true
    • https://uploads.strikinglycdn.com/files/94806dff-52c1-4733-aabb-b17349b249aa/how_to_factory_reset_adt_safewatch_pro_3000.pdf
    • http://jisijuvod.myartsonline.com/usps_how_to_mail_international_letter.pdf
    • https://f1801c53-b3f5-4b94-a9b3-4bb8eb376a66.filesusr.com/ugd/af633f_968348a250e9423aa4884a4d89120468.pdf?index=true
    • https://s3.amazonaws.com/vuraradaso/dinet.pdf
    • https://uploads.strikinglycdn.com/files/3a92bcc9-2cd2-4bbb-9ac2-ad503cec23ec/xofazajugelikidu.pdf
    • https://s3.amazonaws.com/dotivaf/91406672639.pdf
    • https://s3.amazonaws.com/gixirojozogufux/child_care_action_plan_template.pdf
    • https://s3.amazonaws.com/fujadabez/24743941242.pdf
    • http://lifobem.myartsonline.com/36482299811.pdf
    • https://7e073981-ad1c-4081-8dc0-76946ba36063.filesusr.com/ugd/c4f63d_eb9490f3cdf5414d95f8fea0d5a0ab68.pdf?index=true
    • https://s3.amazonaws.com/ladiwuzetawedi/dodafitirupelega.pdf
    • https://uploads.strikinglycdn.com/files/041eec2b-4a0c-416e-a83e-056be515da5e/how_long_do_you_cook_a_25_lb_turkey_in_a_roaster.pdf
    • https://s3.amazonaws.com/fixararololu/83452517218.pdf
    • https://s3.amazonaws.com/pogolo/50635310688.pdf
    • https://8f0c9b82-9570-4081-bbb7-5e23a534ea09.filesusr.com/ugd/7008f3_3d4205ae3107411fb3db0de6e583be8e.pdf?index=true
    • http://kipejefanowisu.atwebpages.com/asp.net_mvc_tutorials_kudvenkat.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f22d.bin
a6e2d5a5f10f5c2c1a06bb789ab2b34c9a370456854a2da805d5e9c580c68999		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF22D 5548 bytes
font_01_sfnt_off000104f4.bin
809b25b0ebabf78099870f9cca975993b1594af00d1903dd35a572c3fece5978		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104F4 10724 bytes

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