Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc5b340622b966e5…

MALICIOUS

PDF

83.9 KB Created: 2021-04-05 03:07:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 64f16779544952d876df0a5fbdb2cc20 SHA-1: e6a42d400611d25b2c046f78840b24c31ffe9e19 SHA-256: bc5b340622b966e5e9b60dd6178b0e0956bf61450de0419f0bd947f2e9094ba6
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains and Weebly-hosted files, indicating a link farm. This is further supported by heuristics flagging it as a 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for SEO manipulation or to distribute further malicious content. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution attempt.

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 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://jottigo.ru/strik?utm_term=what+is+a+lifespan+list+the+five+developmental+stages+of+life PDF link annotation
    • https://temazojirilezin.weebly.com/uploads/1/3/2/3/132302863/dowajilegowediz.pdfIn PDF document text
    • http://carbackseat.site/how_to_use_stanley_40_amp_battery_charger73lhh.pdfIn PDF document text
    • https://lexawuvake.weebly.com/uploads/1/3/4/6/134610488/5000309.pdfIn PDF document text
    • http://cetakchantek.com/244804918282zdbj.pdfIn PDF document text
    • https://nosodawef.weebly.com/uploads/1/3/4/6/134693330/gasog_pupagejizasuvov_vifedu.pdfIn PDF document text
    • https://nidikibadut.weebly.com/uploads/1/3/1/4/131453007/6458991.pdfIn PDF document text
    • http://hairsprof.ru/sejufubejeziwa2jh53.pdfIn PDF document text
    • http://copyrightsupporthelpcenter.com/summary_of_the_lorax_bookkc51w.pdfIn PDF document text
    • https://viwezoluzuwa.weebly.com/uploads/1/3/4/4/134401695/1351001.pdfIn PDF document text
    • https://toralalog.weebly.com/uploads/1/3/1/4/131436966/e66d3186905f8.pdfIn PDF document text
    • http://onatural.space/jetasanuxakovulowi8irpy.pdfIn PDF document text
    • http://tajawuxelefa.22web.org/rachmaninoff_paganini_rhapsody_18th_variation.pdfIn PDF document text
    • http://ipoteka.net/bedamitawimibuzaebaa9.pdfIn PDF document text
    • https://somusepuxe.weebly.com/uploads/1/3/1/0/131070447/39f74.pdfIn PDF document text
    • http://scriptbook.xyz/48354331411xcerv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zokitidekav.epizy.com/information_security_policy_template_uk_2019.pdfIn PDF document text
    • http://tizifeb.rf.gd/4008376631.pdfIn PDF document text
    • http://wisotujapu.epizy.com/shipping_clerk_job_description.pdfIn PDF document text
    • http://vofugureko.rf.gd/48854110264.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_off00010907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10907 5432 bytes
SHA-256: 4208760aae7d3d51471d89722cee37ad67aa8f4c943223cd6dea64f57a6b823c
font_01_sfnt_off00011b76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B76 10612 bytes
SHA-256: 4682180f6c75e5c82a111ba5a8d9de04599a491d8735f5615c8213c53e8c6eb5

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