Malicious PDF — malware analysis report

Static analysis result for SHA-256 88957c2e038a70d1…

MALICIOUS

PDF

69.8 KB Created: 2021-02-25 00:05:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 91cb19ff30b97f65be726bcbf230b6cf SHA-1: 0093fa131554333141cf2a1c848281417c152329 SHA-256: 88957c2e038a70d1873eda7ec53d4e686e58dca02660ffc9077c222e67549d0a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of a 'download button' lure further supports this, aiming to trick users into downloading a payload.

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bologen.ru/strik?utm_term=canon+t4i+battery PDF link annotation
    • https://zeberafuduzugag.weebly.com/uploads/1/3/2/6/132682167/1730ed597dadd44.pdfIn PDF document text
    • https://xinuluparos.weebly.com/uploads/1/3/0/9/130969110/517077.pdfIn PDF document text
    • http://dofuluxaruze.22web.org/easl_guidelines_hepatorenal_syndrome.pdfIn PDF document text
    • https://sipizoreju.weebly.com/uploads/1/3/4/1/134131451/kuwopexajis.pdfIn PDF document text
    • https://tadomowiwelam.weebly.com/uploads/1/3/4/7/134744739/9034623.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367281/normal_5ffc8f2c570eb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380395/normal_5ffac1a81272c.pdfIn PDF document text
    • http://bebosebe.66ghz.com/busewejajumu.pdfIn PDF document text
    • http://rivorumijarugen.22web.org/commonly_confused_words_practice_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372740/normal_5fe9a36113ebd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476420/normal_5fdbb180e260e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nepogewapiw.epizy.com/41052014098.pdfIn PDF document text
    • http://fomuzuzidoduvi.epizy.com/sagijamazovebudakalesixis.pdfIn PDF document text
    • https://s3.amazonaws.com/sowirutelevolur/75740619403.pdfIn PDF document text
    • http://gazepofibugas.epizy.com/combiner_plusieurs_en_ligne.pdfIn PDF document text
    • https://s3.amazonaws.com/wonumafubij/tobexebeluzezigovodatu.pdfIn PDF document text
    • https://s3.amazonaws.com/sakaburepagase/sqlplus_format_output_for_email.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_off0000d4bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4BC 4704 bytes
SHA-256: 6fbffd782fa8f57b133fa987a8df49abe486eb91975c395535b26e3eccbc3330
font_01_sfnt_off0000e4d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D5 11064 bytes
SHA-256: cb243abfcf1bc0894ebb07a7bcdb1f2dd61ce174334d48c162ffd41b9c1a21a2

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