Malicious PDF — malware analysis report

Static analysis result for SHA-256 39db0bf660d0616a…

MALICIOUS

PDF

83.1 KB Created: 2021-02-27 12:15:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 882dda9dfb1b382f0282b78bbd1e1a45 SHA-1: b1fa235d246049628739f2f5558c6beab350e121 SHA-256: 39db0bf660d0616a75bef65efaf04dee395bacfd7f6506489c0772019a89a569
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. One of the embedded URLs, 'https://jacksth.ru/wb?keyword=how%20to%20setup%20amazon%20echo%20show%205', appears to be a lure for users seeking information, potentially to redirect them to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/wb?keyword=how%20to%20setup%20amazon%20echo%20show%205 PDF link annotation
    • https://gukamixi.weebly.com/uploads/1/3/4/0/134042495/3645850.pdfIn PDF document text
    • https://tamaxanafe.weebly.com/uploads/1/3/1/8/131856242/giwutepuk.pdfIn PDF document text
    • https://xolijusir.weebly.com/uploads/1/3/4/0/134016651/980e45628f8.pdfIn PDF document text
    • https://neweruruxoponi.weebly.com/uploads/1/3/1/4/131453136/68e3c66d4f50fc.pdfIn PDF document text
    • https://felunazajejo.weebly.com/uploads/1/3/5/9/135959991/mutosokili_jazowamidomofe_nitonene.pdfIn PDF document text
    • https://kikitepolo.weebly.com/uploads/1/3/4/5/134514310/wububol.pdfIn PDF document text
    • https://luloxewawi.weebly.com/uploads/1/3/0/8/130874123/2275402.pdfIn PDF document text
    • https://kobawepa.weebly.com/uploads/1/3/1/0/131070010/kivonefejij.pdfIn PDF document text
    • https://nerupeke.weebly.com/uploads/1/3/1/4/131483009/1647586.pdfIn PDF document text
    • https://sekilulijafos.weebly.com/uploads/1/3/1/4/131438177/nilibebe.pdfIn PDF document text
    • https://nimivisedasefu.weebly.com/uploads/1/3/1/0/131070972/3563685.pdfIn PDF document text
    • https://fewefemuge.weebly.com/uploads/1/3/4/3/134372507/82117a9533d8bb5.pdfIn PDF document text
    • https://jimivisimobud.weebly.com/uploads/1/3/4/9/134901817/zotasuzadaw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://laroruteze.epizy.com/the_ones_who_walk_away_from_omelas_cite.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA3 5104 bytes
SHA-256: 76c86a5f448a00f84a98e50e80334f68eaa5f84fef186adb34553f16093b73ac
font_01_sfnt_off00010ce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE8 10512 bytes
SHA-256: a2f0393eea67d8460e4823ea79a3b04e49baa3d2ea09467d9fb85dcb5186ed7e
font_02_sfnt_off00013100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13100 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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