Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd4bf8986c7477f5…

MALICIOUS

PDF

95.1 KB Created: 2021-05-19 01:54:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 065ba50723540e5349d633f6b41e3f7f SHA-1: dca60173eeb04aebb5982bee36c11efda26b2829 SHA-256: bd4bf8986c7477f5d44455aea066b9fe534509c14c419fa81d2a21846a38a870
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 0.9988

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xajibur.ru/strik?utm_term=hack+zombie+tsunami+full+pet+ios PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4486563/normal_60524aee4a928.pdfIn PDF document text
    • https://konevolog.weebly.com/uploads/1/3/1/6/131606720/tamumokapuwure_vominutabut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372985/normal_6021acfcc6218.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405674/normal_5ff1637c87be9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369146/normal_5ff0e83005788.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408701/normal_60132265a246d.pdfIn PDF document text
    • https://vojubewerele.weebly.com/uploads/1/3/4/0/134013512/sukenuker-gunekudesolo-vobuxu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498345/normal_5fda506518958.pdfIn PDF document text
    • https://jezosodakadofa.weebly.com/uploads/1/3/4/3/134376186/8efd70a51cc5.pdfIn PDF document text
    • https://lusenivusimutom.weebly.com/uploads/1/3/4/8/134887898/430d4754e6f.pdfIn PDF document text
    • https://dujakoxuk.weebly.com/uploads/1/3/1/4/131483447/rinev_xexej_muvuguve.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380073/normal_5fd8c95fdad31.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368485/normal_5fcab16ae9d80.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fizufanotujo.epizy.com/media_moment_mini_congressional_committees_answer_key.pdfIn PDF document text
    • http://zusobowes.rf.gd/football_game_free_for_windows_xp.pdfIn PDF document text
    • http://najusibajeful.rf.gd/best_selfie_stick_for_skiing.pdfIn PDF document text
    • http://katibabiziv.epizy.com/abas_3_scoring.pdfIn PDF document text
    • http://womopemi.epizy.com/secretary_2002_imdb_parents_guide.pdfIn PDF document text
    • http://gotojin.rf.gd/ateroma_en_equinos.pdfIn PDF document text
    • http://roparewuna.rf.gd/pavujevelitar.pdfIn PDF document text
    • http://vopepogam.rf.gd/31114083234.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE222 6744 bytes
SHA-256: b29f9350a720d2da9dc50567d08c4a82684db1fcb28a47e3a5788345b392d808
font_01_sfnt_off0000f2d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D6 4260 bytes
SHA-256: dabf734dfed52baeede6be8711e3db0daeeb11005e2038cfe1ff34a618138bbf
font_02_sfnt_off000100d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D3 5280 bytes
SHA-256: b202c5943964419651c252a9f7281f0a4c669ff8cfae7ba8f801d6f9fff11bd3
font_03_sfnt_off000112bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112BB 3840 bytes
SHA-256: 1c5e31e501a2bd7a3988f11812319d27fa28efdde7d3487322331911d37c9a5a
font_04_sfnt_off00012174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12174 24272 bytes
SHA-256: 8bcfd2ca117c1e0d8b7b4150b30f13c70ec82245b34ee1d8dbc1ac40764c6d52
font_05_sfnt_off0001573e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1573E 16488 bytes
SHA-256: 3e6e7583c9571e776be552480bc065eb520737cd77d14a25de2019915c00be3a

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