Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1b607e0451a5329…

MALICIOUS

PDF

81.4 KB Created: 2020-11-11 21:42:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: a0d26f9bc256f42f9d64c9310924e755 SHA-1: 165a8e34e96ba4f36e3d6e0b1d9d502af4ade331 SHA-256: c1b607e0451a53295741329c34eb09779fa465ead091f7dfc97a4af098035da7
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm used for phishing or malware distribution. The document body, though heavily obfuscated, appears to be a lure related to a "Hochtief annual report 2015". No scripts were extracted, but the presence of numerous external links indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffnew.ru/aws?utm_term=hochtief+annual+report+2015 PDF link annotation
    • https://wiruwopifezub.weebly.com/uploads/1/3/4/3/134345133/2086384.pdfIn PDF document text
    • https://tiwilofudux.weebly.com/uploads/1/3/1/6/131606348/7074581.pdfIn PDF document text
    • https://mitegasur.weebly.com/uploads/1/3/1/8/131871816/3921289.pdfIn PDF document text
    • https://peturenu.weebly.com/uploads/1/3/4/4/134401199/nuxexivemanuje_xefigigini_jenipopakuwuvi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393193/normal_5f982ef214297.pdfIn PDF document text
    • https://bupaduzisi.weebly.com/uploads/1/3/4/4/134475958/buwevelunu_xalelaje_mobawibemudewo.pdfIn PDF document text
    • https://kagilovudugavap.weebly.com/uploads/1/3/1/1/131164538/1a903d6169e.pdfIn PDF document text
    • https://tejebufu.weebly.com/uploads/1/3/4/3/134353082/b3af7c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413867/normal_5f9e91097dfec.pdfIn PDF document text
    • https://zanelonovubut.weebly.com/uploads/1/3/4/3/134315015/7026027.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/eee674b4-bbfe-44a2-a6af-5958a4b07c91/71644179244.pdfIn PDF document text
    • https://s3.amazonaws.com/mutirexa/dimension_pre_emergent_granular.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_off0000ffdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDF 5336 bytes
SHA-256: 4836c3e09d98e806f13d2f8ac5206b22e98589d032ab5b2feac6564a8b742650
font_01_sfnt_off0001120c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1120C 11696 bytes
SHA-256: f12875726c876a24b8204404985f942f512bfbdf450adb766bd845d0ec1cf4f7

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