Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6c283ea2585be37…

MALICIOUS

PDF

75.6 KB Created: 2020-12-04 13:44:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: fad83ad33c030dac4dc88b6c5de39132 SHA-1: 123ed60bc43839bded8def9bcf5c4b7854cf1d72 SHA-256: f6c283ea2585be3748668b85b2e1f816b49355afa50f2d43ef35b416bc3d5ba9
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 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://trafftec.ru/123?utm_term=r%252Fpopping+shut+down PDF link annotation
    • https://vemulasi.weebly.com/uploads/1/3/4/5/134509822/riwole.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469351/normal_5fbe534095904.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409602/normal_5fa030e3a1c76.pdfIn PDF document text
    • https://solugukaxazazo.weebly.com/uploads/1/3/4/7/134748989/3242550.pdfIn PDF document text
    • https://gapidekejoz.weebly.com/uploads/1/3/4/8/134876705/0ef5cf.pdfIn PDF document text
    • https://tajekuludukomas.weebly.com/uploads/1/3/4/4/134498487/7024715.pdfIn PDF document text
    • https://resonorur.weebly.com/uploads/1/3/4/8/134874279/gewerudagikegiwof.pdfIn PDF document text
    • https://lenalavawin.weebly.com/uploads/1/3/4/7/134732275/8286777.pdfIn PDF document text
    • https://padomixuboji.weebly.com/uploads/1/3/4/5/134527159/vugagux.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc0bf1b9955c744b53ac36d/t/5fc117b41972c46e3cc514f0/1606490036986/nasidoruvupadeworabegumi.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc18272ff13940aa243ecad/t/5fc5d7d73570fb44d1cd3e4b/1606801367901/fexavizozusaxe.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC71 7336 bytes
SHA-256: beec8fc54b7e49d4fa0d5e090a68a760e9c18d70938a4358eb221207b23f941c
font_01_sfnt_off0000df63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF63 5016 bytes
SHA-256: cd7dba74389e769cfd3b14a4cd940a6dce945bfafd1a5528a45a3479f453966d
font_02_sfnt_off0000f08e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08E 3732 bytes
SHA-256: 85e4a4c045cf9bf0430bd8b605cf82edd67da12f6436d0bc96ac1043b49271f4
font_03_sfnt_off0000fa96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA96 11336 bytes
SHA-256: c3706814923d2a23228ed505ff2b59f2e9aa8835fd1d202f946bac43a8ab6dbc

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