Malicious PDF — malware analysis report

Static analysis result for SHA-256 4da63274cfe8a07d…

MALICIOUS

PDF

74.9 KB Created: 2021-02-17 19:23:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: ecd70c61a9eb513a61740b78c5a36242 SHA-1: 75b9aed20c80e21b49eea910cb95125ada56d4da SHA-256: 4da63274cfe8a07de2e4c0945ad9efdad330ceb7463417d80d628f77fb5fc165
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The embedded URLs likely lead to further malicious content or phishing pages.

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+are+the+7+habits+in+order PDF link annotation
    • https://datedevob.weebly.com/uploads/1/3/1/3/131381982/suvuriveba.pdfIn PDF document text
    • https://doruxajowivabog.weebly.com/uploads/1/3/4/8/134870444/c5ba7e5a040.pdfIn PDF document text
    • https://tolajugim.weebly.com/uploads/1/3/4/6/134647220/tofusikutipul.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464297/normal_5fe1a30f1412a.pdfIn PDF document text
    • https://cdn.sqhk.co/kazamepa/ggevSgd/dachshund_dog_puppies_for_sale_in_chennai.pdfIn PDF document text
    • https://cdn.sqhk.co/wibetaxor/zxOciix/jugar_flight_simulator_c130_training.pdfIn PDF document text
    • https://xowebanum.weebly.com/uploads/1/3/1/4/131453595/riwogajowof_jeten_mavojovomikoxis_lanenatobuz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388067/normal_601c5bee3e074.pdfIn PDF document text
    • https://zizojatemizowen.weebly.com/uploads/1/3/4/0/134016780/nefijetinozeju_raxudopogupeva.pdfIn PDF document text
    • https://ritesevegozuvij.weebly.com/uploads/1/3/1/6/131606822/6c8054d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372376/normal_602ae9246249c.pdfIn PDF document text
    • https://marevesebogu.weebly.com/uploads/1/3/0/8/130813877/kugejuvotixomebi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/toniseligiwuzux/os_booting_software.pdfIn PDF document text
    • http://muxolisakij.epizy.com/timiwik.pdfIn PDF document text
    • http://bubotelerokuz.rf.gd/85134869712.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_off0000ebe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE9 5112 bytes
SHA-256: 88fd4ec1ee5357a80a74102673d54da6983258c26b0599a937bad3a9f84fbc4d
font_01_sfnt_off0000fd54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD54 9824 bytes
SHA-256: aca7fb81c74be13beaed0d05a248d65ee98abd122d6a92ef3728ef7886d1fe15

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