Malicious PDF — malware analysis report

Static analysis result for SHA-256 89a470a59445b978…

MALICIOUS

PDF

66.2 KB Created: 2021-04-06 21:28:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: c169c9376ba22c95eca3ee4500ac8631 SHA-1: 565fb53ca286012388e95413161c05591229ef59 SHA-256: 89a470a59445b9787cd49bca4d7ff8bf7b2c2cccb2c7e207cfdbbe3acfca7932
126 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm and has been flagged by ML classifiers and ClamAV as malicious phishing content. The embedded URL and a disposable hosting URL suggest an attempt to redirect users to malicious sites, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/wix?keyword=algebra+1a+final+exam+review+answers PDF link annotation
    • http://raraveluwogevuw.mypressonline.com/56189162769.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409818/normal_606b9223339d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393763/normal_6034d981f24e3.pdfIn PDF document text
    • http://lami-lashes.site/a_level_geography_hydrology_notes041rz.pdfIn PDF document text
    • http://fumumowovufa.mywebcommunity.org/dojigewo.pdfIn PDF document text
    • http://phillipen.online/hp_deskjet_3050_j610_series_software_download_freeduv6r.pdfIn PDF document text
    • http://xonigej.mypressonline.com/bodybuilding_workout_program_for_beginners.pdfIn PDF document text
    • http://pebifakonek.sportsontheweb.net/vozurotefidolosaguwi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503617/normal_5fdae5abdebac.pdfIn PDF document text
    • http://tuwukadinem.mygamesonline.org/tfal_deep_fryer_recipes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jozopon.rf.gd/nolukinojemalawarejowade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18d7e697-3478-4f63-801f-1a753d0cb8e7/xajulawunomizazeduzufa.pdfIn PDF document text
    • https://348ddb29-83e1-4812-94a1-743b72ef9b42.filesusr.com/ugd/23b571_7372feb5ce6642208c76d45f26ce3cf3.pdf?index=trueIn PDF document text
    • http://rolezudebozi.rf.gd/how_to_fix_disabled_iphone_5c.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/509825d0-eb1e-455f-b5e8-87a0bff39656/66726860867.pdfIn PDF document text
    • http://vevemaj.rf.gd/68859846288.pdfIn PDF document text
    • https://989eff4c-946f-4221-9817-1a8d60f2082d.filesusr.com/ugd/7edf14_0526a68ff93249d4a982f1e14a3d3da7.pdf?index=trueIn 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_off0000c556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC556 5488 bytes
SHA-256: e0906d714f093878ac64d13793aa96d0b85c42660970c6f794106c9d860b3dc8
font_01_sfnt_off0000d80f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80F 10544 bytes
SHA-256: 1042d805c9c95df5550f37c06c4580c05e019c0868cee36ed510e1d62270b75d

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