Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4fc34d72aaf3948…

MALICIOUS

PDF

75.0 KB Created: 2021-04-09 16:03:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: bd2985dcdf808eb3d2b6097ce41c365f SHA-1: 0505196bd40ab44994940e256471efa6699157b1 SHA-256: d4fc34d72aaf39485962bcb3ccb7786dc7be9efe91b23c2c0d0979b0d59016bd
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic firings suggest it functions as a link farm, directing users to multiple external URLs, one of which is associated with a phishing lure related to workout results. No scripts were extracted, but the PDF structure and embedded URLs point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://golowaki.ru/strik?utm_term=starting+strength+workout+results PDF link annotation
    • https://cdn.sqhk.co/xubuzivo/Pjjauet/jisaxavovugodilo.pdfIn PDF document text
    • http://pedron.fun/65545264262xbjru.pdfIn PDF document text
    • http://study-english-04.space/98588286010bp8ky.pdfIn PDF document text
    • http://kukudufuwole.iblogger.org/free_cohabitation_agreement_template_australia.pdfIn PDF document text
    • http://bettyloustintruckbbq.com/gufesasitujumilekuvupudf0mcq.pdfIn PDF document text
    • http://kegitolufisiwa.iblogger.org/free_safety_downloads_software_for_windows.pdfIn PDF document text
    • https://cdn.sqhk.co/vabalogu/f4O9iiv/registro_brasfoot_2020_funcionando_atualizado.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465701/normal_6007197538dea.pdfIn PDF document text
    • http://usecabinets.xyz/reported_speech_in_english_grammarp60c1.pdfIn PDF document text
    • https://cdn.sqhk.co/jibezilesu/hibnJgj/nutavelu.pdfIn PDF document text
    • http://dezobewasovof.iblogger.org/jikuloremuxunizuzuwusaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489429/normal_6042af4c0b5a5.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://baduwujik.rf.gd/formazione_catanzaro_calcio_1983-_84.pdfIn PDF document text
    • https://s3.amazonaws.com/wifukedot/30988219734.pdfIn PDF document text
    • https://s3.amazonaws.com/loranoduzuja/joxuwudopofukalasum.pdfIn PDF document text
    • http://xopalotopobeda.rf.gd/sepotulogu.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_off0000e469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE469 5208 bytes
SHA-256: cd9fe6a876bdd21dfea37086c93cc9caa6d109cf3fd5b8cefb70685b0d9a1485
font_01_sfnt_off0000f629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF629 11548 bytes
SHA-256: a1b1ec94a47729e90e2f35f350339c8e18a264d88f4f9cec6ea5aaf8e56dbd55

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