Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff1bf212a82dda27…

MALICIOUS

PDF

81.8 KB Created: 2021-04-18 18:35:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 4b7b02ffe52f0bd82bb5c1e6f94144fe SHA-1: 707e7322b9c0966b50b81fc354b3ee1d7e22015b SHA-256: ff1bf212a82dda27090220c87788a62ea90d4e4f3f07ec767b2c8ec227334456
186 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains numerous external links, many pointing to disposable hosting, and one specific URL related to printer drivers, suggesting a phishing or malware distribution lure. The PDF structure and embedded links indicate an attempt to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://baarspo.ru/strik?utm_term=hp+officejet+pro+8600+printer+drivers+for+windows+7 PDF link annotation
    • http://lovepositions.info/35793125115vnwst.pdfIn PDF document text
    • http://roflan.site/miss_universe_2017_question_and_answerb9417.pdfIn PDF document text
    • http://inscarusa.info/6125497187448kt4.pdfIn PDF document text
    • https://jaloteke.weebly.com/uploads/1/3/4/0/134096083/277127985a.pdfIn PDF document text
    • https://galanutix.weebly.com/uploads/1/3/4/5/134591813/3104425.pdfIn PDF document text
    • http://tubixiwuwura.iblogger.org/pijoxives.pdfIn PDF document text
    • https://cdn.sqhk.co/murajefovel/jghdqGo/1842637728.pdfIn PDF document text
    • https://cdn.sqhk.co/fegujajox/haHbRMe/28636215295.pdfIn PDF document text
    • https://cdn.sqhk.co/tibakekavero/cYm0jbp/ramebuzinu.pdfIn PDF document text
    • https://cdn.sqhk.co/litalile/hfihhhb/vobefegebexexuzanijesezum.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://21e323bd-7fdd-46e9-a6c7-4880e76d7610.filesusr.com/ugd/0a51c1_fc69717a57f940a7ba18b9587f1b19fd.pdf?index=trueIn PDF document text
    • https://6131fb9f-3080-406c-a6ab-c4686b6a2f6f.filesusr.com/ugd/52be6f_870280dc715240ea840c9173377cc6e1.pdf?index=trueIn PDF document text
    • https://78905da9-dd21-4190-abaa-c894c042e703.filesusr.com/ugd/851c7c_3ec2197ae452429cb73d473a5aeaa525.pdf?index=trueIn PDF document text
    • https://6f1239e7-da96-47bf-8adb-22d47a96a9da.filesusr.com/ugd/bb5a15_bf43ef4e8824474892e7b275a7bf586f.pdf?index=trueIn PDF document text
    • https://e1eccfe9-8888-4f52-a155-e9c8e84e0752.filesusr.com/ugd/4fb05f_9ed5adc5f13542d1a2879c75de21f3ca.pdf?index=trueIn PDF document text
    • http://sebiwafexudezo.rf.gd/78773387962.pdfIn PDF document text
    • http://turegipamikum.epizy.com/pravastatina_dosis.pdfIn PDF document text
    • https://f803bf1b-e1c2-47f6-a41f-c9785c88fbd4.filesusr.com/ugd/bf07b1_ce6b498c5e354d7899fa9b5cd7a55fe5.pdf?index=trueIn PDF document text
    • https://6e00f30c-c2f4-4f8b-b3fa-04142e93d3a6.filesusr.com/ugd/7b3c9f_4036e346603e4cefb4835dc7c1fcd1e3.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_off000101c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C9 5664 bytes
SHA-256: 13f3f1ecf879edc40502670b897e3ff9f256f6bd72f9fab43e2504f75ff39498
font_01_sfnt_off00011550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11550 10684 bytes
SHA-256: 6abdd998c4d56063e61c6a813a84ef1b18416245431b0db365eeee6789f1e118

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