Malicious PDF — malware analysis report

Static analysis result for SHA-256 5546ba46d64e2d0b…

MALICIOUS

PDF

77.2 KB Created: 2021-05-10 18:40:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: f0dd7c657133be8c0f31f3b6f7cc64ce SHA-1: e83e4f86c023c9bca4e0952275e26ff4eff2e916 SHA-256: 5546ba46d64e2d0ba78284f4f89a3211f3d30fb55c9f8e7911bac3b6944917aa
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and employing UTM parameters, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns align with common phishing lures designed to trick users into downloading malicious content or providing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://leonvi.ru/strik?utm_term=k1el+winkeyer+usb+driver PDF link annotation
    • http://mavpa.fun/18577284228wtxff.pdfIn PDF document text
    • http://help-ruleviolation.com/43472746662q0fyv.pdfIn PDF document text
    • https://rilavopitokutod.weebly.com/uploads/1/3/4/7/134765049/wuwazupu.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • http://harkateine.fun/315719540260iq83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405413/normal_602da63bdd75c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413243/normal_5fd1e11c13122.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476302/normal_5fd88a9417081.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468270/normal_602bf5a57e83e.pdfIn PDF document text
    • http://domen3.club/garden_gnome_halloween_costume_adultsn6d6i.pdfIn PDF document text
    • https://lefagetali.weebly.com/uploads/1/3/2/3/132302894/6218026.pdfIn PDF document text
    • http://uscreditmonitoring.info/bingo_game_blank_templatedam1p.pdfIn PDF document text
    • https://gewaxuselez.weebly.com/uploads/1/3/4/2/134265722/lizipitasawugobu.pdfIn PDF document text
    • http://idealicacolumbia.site/appropriate_preposition_for_bcsuxloz.pdfIn PDF document text
    • https://kifosaxuwaf.weebly.com/uploads/1/3/4/0/134016965/regizevugarawi_jafodige_saxujupom.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/pajorawususawoberofe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3de0c465-40ad-451e-aa90-b77666f0679b/canon_mx922_wireless_connection.pdfIn PDF document text
    • https://s3.amazonaws.com/jifesu/kozewunerepogafimeg.pdfIn PDF document text
    • https://s3.amazonaws.com/zibenoroduzuw/2786559914.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e9a4c50-7a78-403e-967d-db6963601ca1/is_5x5_enough_for_hypertrophy.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF289 5088 bytes
SHA-256: d0c9dcbf54e4ad4b528f1348db6e8f6a7513b7a87df00ef0919eae1078eaad33
font_01_sfnt_off0001040b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040B 10448 bytes
SHA-256: b71270101286029d5b0dca6d4390f41d7b8a98db0198f552e3ad4a7dd56b4973

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