Malicious PDF — malware analysis report

Static analysis result for SHA-256 600e63e743acf279…

MALICIOUS

PDF

33.8 KB Created: 2020-11-08 02:05:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 7deee63e3e120070b968794d50ce42f5 SHA-1: b6e86ff4449d9529a0a4042218c30271e02eef50 SHA-256: 600e63e743acf279f05b405d8924428c3f9f945b5c4be6439a110f87e11580af
126 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 designed to manipulate search engine results or redirect users to potentially malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URIs further supports a malicious intent. While no scripts were explicitly extracted, the structure suggests it's designed to drive traffic to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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/aws?keyword=grandfather+clock+pendulum+rod PDF link annotation
    • https://warakamaluxib.weebly.com/uploads/1/3/4/3/134378328/ed17f.pdfIn PDF document text
    • https://gozofuma.weebly.com/uploads/1/3/0/8/130874065/gedosimosivujojad.pdfIn PDF document text
    • https://rigitugatelimo.weebly.com/uploads/1/3/4/1/134131632/31b549f.pdfIn PDF document text
    • https://donodofi.weebly.com/uploads/1/3/1/8/131856097/sinamiripusiwot.pdfIn PDF document text
    • https://xepefebew.weebly.com/uploads/1/3/4/4/134440437/b479f97.pdfIn PDF document text
    • https://tiferivirukituk.weebly.com/uploads/1/3/4/4/134433041/c0c86826d4876d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://dagirivemaj.files.wordpress.com/2020/11/mobile_home_purchase_agreement.pdfIn PDF document text
    • https://zatejoru847961968.files.wordpress.com/2020/11/72489844693.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30249b8a-4b58-4fb7-b344-53f83d0624c0/9538221546.pdfIn PDF document text
    • https://juzikarew.files.wordpress.com/2020/11/10354068878.pdfIn PDF document text
    • https://nizowowe.files.wordpress.com/2020/11/midesifitir.pdfIn PDF document text
    • https://biguwapagibu.files.wordpress.com/2020/11/64105261824.pdfIn PDF document text
    • https://tenuxenoboge.files.wordpress.com/2020/11/ropavo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/319c1a5b-ac2e-4e6a-a706-7ea7ba6440ba/powifigugasejezuv.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_off0000457f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x457F 5312 bytes
SHA-256: 21baae76ce9a0d823fc43433c9b33d2c84c130917316bcda8542ca0986c57ec1
font_01_sfnt_off0000576c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x576C 10408 bytes
SHA-256: 158dbff7994d93e13f64667a10b802e2dda9f36a68c6aa104d13c9806101b2fe

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