Malicious PDF — malware analysis report

Static analysis result for SHA-256 556030274ed8025c…

MALICIOUS

PDF

72.1 KB Created: 2021-03-10 01:44:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b941d35cb8ffb4b4f9363b3ffafb886c SHA-1: af43dc9dd29702f8a7a4c94108cd4ce159f8c9e0 SHA-256: 556030274ed8025cbdb761b9ea320ecadf942733005900b8396e518a61103185
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' indicating a large number of outbound links. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded URLs point to potentially malicious domains, and the document's structure suggests it's designed to drive traffic to these sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://vilenefex.ru/wix?keyword=reading+for+advanced+composition+free+pdf
    • http://jobs-ingenieur.best/gufajofikusojexipe69p9f.pdf
    • https://cdn.sqhk.co/kawurefeki/jgjgjCi/50802107113.pdf
    • https://cdn.sqhk.co/wifavizen/pwNgjAB/assistive_touch_for_android_2020.pdf
    • http://bilkaita.space/synco_baradithmu3z.pdf
    • https://cdn.sqhk.co/pimidima/hdJIFhf/27711114480.pdf
    • http://idealslimitaly-ufficiale.site/modified_bessel_equation61fuj.pdf
    • http://sluzhba1.net/wafedilewaserinurejudaakui9.pdf
    • https://tekoboxini.weebly.com/uploads/1/3/0/8/130814877/gabudemowapomiviwep.pdf
    • https://cdn.sqhk.co/bujomukoda/3Tgfiif/pasenesapezaledam.pdf
    • https://zirufijidure.weebly.com/uploads/1/3/5/3/135316647/kojapud.pdf
    • http://nefuzixitelu.iblogger.org/digitonisesanexad.pdf
    • http://flash-sar.online/tibedunijidixufuxivixuje33451.pdf
    • https://cdn.sqhk.co/juvebuzizej/CNjaVKL/ahly_vs_zamalek_super_cup_live_stream.pdf
    • https://zisatusomet.weebly.com/uploads/1/3/4/8/134872515/1621881.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/3197c45f-b4a2-47e3-934c-a87b41a2197f/11819476253.pdf
    • https://uploads.strikinglycdn.com/files/3cb9c3dc-e8fb-4c2a-a89e-e6f5c003c4d5/addition_and_subtraction_of_fractions_example_problems.pdf
    • https://uploads.strikinglycdn.com/files/2f6c2cc4-b347-4e0d-99f9-b011a34a25bf/wesifofusonenem.pdf
    • https://uploads.strikinglycdn.com/files/d1f5140e-1e4a-406f-a13c-67913ba0d8b4/fokipowi.pdf
    • https://uploads.strikinglycdn.com/files/def15fda-8ed4-4a60-a468-849b827eb265/rilukatofumexokizobelavur.pdf
    • http://pifaramurul.rf.gd/tirixepo.pdf
    • https://uploads.strikinglycdn.com/files/29d9aef6-1404-420e-a1d6-292a3714a30a/58106260215.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf34.bin
eb5f0b9cd16c469b8f49249ff2ab30ae3eea648b597f74271beccc3adff0f6b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF34 5300 bytes
font_01_sfnt_off0000e128.bin
423d7e8ecefb0953c529bf1001a62019a5ab75d97c1b52151312c7fc442dffe0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE128 10616 bytes
font_02_sfnt_off000104c0.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104C0 4324 bytes

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