Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9b60e00f1e2f742…

MALICIOUS

PDF

65.0 KB Created: 2021-01-19 01:09:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 4099223deb30f9b6f3c05b20db0c3540 SHA-1: 17366ac98283c0e880c21dcdcc98e0bdbd2a8327 SHA-256: b9b60e00f1e2f7425635f3ae129706d0bd57f64f1f0a75b342f0eb5a55a31191
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 hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a malicious document 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://trafffi.ru/123?utm_term=d%252Ft+carson+enterprises+inc PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367271/normal_5f89e9cfad742.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413693/normal_5fc3d9883e75e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488842/normal_5fae3d950bc37.pdfIn PDF document text
    • https://zanixikowupu.weebly.com/uploads/1/3/1/4/131437740/dudimupapuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448548/normal_5fa2834e8cb16.pdfIn PDF document text
    • https://fejamelaluboj.weebly.com/uploads/1/3/4/3/134311679/4142574.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473379/normal_5fd9bc3a528b8.pdfIn PDF document text
    • https://tovepeluzon.weebly.com/uploads/1/3/4/3/134385389/1263818.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/199877.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426547/normal_5fa45de941c1d.pdfIn PDF document text
    • https://bewapuvin.weebly.com/uploads/1/3/1/4/131453684/4126579.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/sugosubexez/59696893055.pdfIn PDF document text
    • https://s3.amazonaws.com/suzixegazunow/western_civilization_textbook_8th_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/jozetej/pasawumirakeririvaxuvewu.pdfIn PDF document text
    • https://s3.amazonaws.com/fobupojowojon/cinderella_2015_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/mexavofezoxi/melokediwubizubududifozi.pdfIn PDF document text
    • https://s3.amazonaws.com/tapexiw/35428595247.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_off0000c154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC154 4932 bytes
SHA-256: 3fe6fbdeb90c39517a1e385b02f19db6e3ea43adc9df8df71eb4f008f3d79838
font_01_sfnt_off0000d236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD236 10804 bytes
SHA-256: eb731c57ceab52e9012ddca2f0ab58e695543e0ddc4fbf4297303b5ea64cd608

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