Malicious PDF — malware analysis report

Static analysis result for SHA-256 23fbf5dff0221677…

MALICIOUS

PDF

74.8 KB Created: 2020-12-18 04:09:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: a55cb96516a9f5a01d214f862095872d SHA-1: 1fe7429caed9bfa3274262aa692fa12681c67fa4 SHA-256: 23fbf5dff0221677354c4be150c506d7fc80e2b3acabeefa8912f0a6b4f8cda5
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://trafftec.ru/aws?utm_term=directed+by+robert+b+weide+piano+sheet PDF link annotation
    • https://fefajuvojamunuj.weebly.com/uploads/1/3/4/7/134750085/juxaniluwinenusege.pdfIn PDF document text
    • https://neburaguvud.weebly.com/uploads/1/3/4/4/134477844/wepigufowupa.pdfIn PDF document text
    • https://xuzexutibezime.weebly.com/uploads/1/3/4/9/134904436/rojudot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378853/normal_5f8fc65354570.pdfIn PDF document text
    • https://xovobinawulum.weebly.com/uploads/1/3/4/8/134883327/e06e725d4e2e.pdfIn PDF document text
    • https://fodezamu.weebly.com/uploads/1/3/1/4/131407453/wijigomofiweb_lotitosede_jukis_dirum.pdfIn PDF document text
    • https://rodofuzox.weebly.com/uploads/1/3/4/5/134599037/7235377.pdfIn PDF document text
    • https://kelubipo.weebly.com/uploads/1/3/4/8/134891634/vovugikebi.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/0db12311-9a54-4141-83a0-f0799ce5cb6e/76968099903.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc69f2de5c7695ca9c347cc/t/5fd002596e9f3108817efad0/1607467610396/79409776262.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51fae4f0-f8ab-4dba-9faa-d50d7adec876/26945406403.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000f365.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF365 23672 bytes
SHA-256: 80fc09681b1ac1cce3ecaa8af42eee5d516b0bbb43d795c130126b917c424b16
font_00_sfnt_off0000bc75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC75 5464 bytes
SHA-256: f8e67d81eb96286713a0f72d5bf4b09dbd3064c89b626110819fa2c1b00a0ca8
font_01_sfnt_off0000cf0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF0F 10548 bytes
SHA-256: b30f03b5e0c3a089f38708d33a484c7c893df972658069ab3b37d6abb0958883

Open this report in the interactive analyzer, or submit your own file for analysis.