Malicious PDF — malware analysis report

Static analysis result for SHA-256 dddd85a3a47be18f…

MALICIOUS

PDF

80.8 KB Created: 2021-03-12 10:27:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: c0055fb7cfcbc87da43b390e9be228d2 SHA-1: 379db359def4a1bc895766cea7414cb05d13e1b7 SHA-256: dddd85a3a47be18fe83ebcdd2b16f1e37943fb756665b87f5343821efb446b8f
186 Risk Score

Malware Insights

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

The PDF file contains embedded links and metadata suggesting it is part of a link farm designed to drive traffic to various websites, including a suspicious domain 'baarspo.ru'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://baarspo.ru/wix?keyword=hansel+and+gretel+2020+trailer PDF link annotation
    • https://fusofopafufet.weebly.com/uploads/1/3/5/2/135294951/1b0d4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380384/normal_5ff00e4609879.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373987/normal_6006f4e1eeb03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451563/normal_6048427fa665c.pdfIn PDF document text
    • http://shoop-fm.ru/37061132749959qr.pdfIn PDF document text
    • https://tafebitekule.weebly.com/uploads/1/3/0/7/130776603/bf5ba5853b8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501204/normal_60442edacff9d.pdfIn PDF document text
    • http://vir-tus.com/baby_bullet_turbo_steamer_directionsjn1q8.pdfIn PDF document text
    • https://jimivisimobud.weebly.com/uploads/1/3/4/9/134901817/9835963.pdfIn PDF document text
    • http://itfamily.info/648928492660uujn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486969/normal_5fe8e8f23e9a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453563/normal_602d0943688dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452595/normal_600b10671dc3e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384460/normal_5fdd613f15808.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/pirofopafu/abdul_qadir_jilani_books.pdfIn PDF document text
    • https://810dce77-56ab-4324-823a-3549757f4eab.filesusr.com/ugd/1fad07_e925e8c3bedd491a932dcbb4bacb0efc.pdf?index=trueIn PDF document text
    • https://45f91bdd-2b68-4e60-ae2c-b14373ae5332.filesusr.com/ugd/0d089b_dd8151a0e0dd45f9a517718027cc3925.pdf?index=trueIn PDF document text
    • https://591379ed-26d0-4405-baa7-5b8dadede013.filesusr.com/ugd/866ffa_109c214d22dd414aaee74ea020dfc3eb.pdf?index=trueIn PDF document text
    • https://b03e51a8-7171-48c0-94d6-e4c032e6f37f.filesusr.com/ugd/9421c8_49025d6e518847039e83cc44b7c8c014.pdf?index=trueIn PDF document text
    • https://937a8a2d-b41a-4163-aff8-eda6db263557.filesusr.com/ugd/21e6f2_434a92d4f850456d9deb7812e29808b5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/benubapopikaj/77441521864.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF279 4904 bytes
SHA-256: 3ec61be212d9ad12199b41ca6251722236f6792d6ecc5704216c09353e950178
font_01_sfnt_off0001031e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031E 10856 bytes
SHA-256: e1314ef5d07f169f5b447ed085bb743f729d8c9f7c22f80f4feb10bdebc93ba7
font_02_sfnt_off0001277e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1277E 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c