Malicious PDF — malware analysis report

Static analysis result for SHA-256 d16f6b10f5198d0f…

MALICIOUS

PDF

75.6 KB Created: 2021-03-01 00:07:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 6dccf6718494dfaa501333d665cd98ea SHA-1: c3202f92475ebc5c502135628a3a8b4128733a9e SHA-256: d16f6b10f5198d0f2d4bc461234da8f1fcfb051f31ecb885269d761ee572cf8f
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous URLs suggest it's designed to redirect users to potentially harmful content.

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://dugedepap.ru/wix?keyword=cherokee+indian+traditional+clothing PDF link annotation
    • https://pepedojimu.weebly.com/uploads/1/3/1/0/131069997/0f0bc25b8865bd.pdfIn PDF document text
    • http://drilltech.info/joomla_3._9_templates_free_deutsch7cpg9.pdfIn PDF document text
    • http://erogan-oficial.site/kiran_kiran_soorajrd4n0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385850/normal_5feef4c125b8b.pdfIn PDF document text
    • http://filfex.ru/xufuwetewexepivunozi9df7j.pdfIn PDF document text
    • http://zavodtriumf.com/66559433683t7pgp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479925/normal_5fdbab0cb4ce6.pdfIn PDF document text
    • http://garant-ritual.online/42022604332gm5ya.pdfIn PDF document text
    • http://bachanalytics.com/5401380153z8kzh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405467/normal_601525a9d8b46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377656/normal_601e121337ea2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485704/normal_60038730e1eb3.pdfIn PDF document text
    • http://tesar-krd.ru/castles_of_mad_king_ludwig_board_game_rulese8sra.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391037/normal_5fe59bb293da3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403687/normal_602ab710b3282.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407562/normal_6035d5dc959eb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://japinoxizidunub.myartsonline.com/best_penny_stocks_to_day_trade_on_robinhood.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_off0000ecfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFD 4992 bytes
SHA-256: 3199b52f110132a57f9a24a40370f9626f6b5fcd9c00664a97a5ed0cb7651050
font_01_sfnt_off0000fde6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE6 10284 bytes
SHA-256: 88094b6e92f0a0c4b2c02a403b2663c1988c00a2d84d27dbb749ca059270b3aa

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