Malicious PDF — malware analysis report

Static analysis result for SHA-256 c58d9bea4ead92fb…

MALICIOUS

PDF

86.6 KB Created: 2021-04-02 13:33:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 6ae0f3f018599c96e35df1610a8c6f5b SHA-1: 9a4f4993eb33c118f267a575369bd5574d04b804 SHA-256: c58d9bea4ead92fb8c00143861f9ffba319ab13793d9eed117181096c079ef37
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The embedded URLs likely lead to malicious content or phishing sites, and the document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://druttle.ru/award?keyword=alcatel+u5+user+manual+pdf PDF link annotation
    • https://cdn.sqhk.co/lutadamafe/hhewPgd/monstera_plant_grow_in_water.pdfIn PDF document text
    • https://donodofi.weebly.com/uploads/1/3/1/8/131856097/rejiwi.pdfIn PDF document text
    • https://cdn.sqhk.co/wazikunal/dXqkygc/6670504226.pdfIn PDF document text
    • https://poginatiru.weebly.com/uploads/1/3/0/8/130874277/c8b7d94eac.pdfIn PDF document text
    • https://cdn.sqhk.co/pevelefotuve/dqhhdih/apple_pages_wedding_invitation_template.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475577/normal_6009067b7bf6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413848/normal_603c05e26324a.pdfIn PDF document text
    • https://xajijalati.weebly.com/uploads/1/3/3/9/133997138/bomafu-juwot.pdfIn PDF document text
    • https://mubisajapesufu.weebly.com/uploads/1/3/4/6/134620746/568fcc3043740.pdfIn PDF document text
    • https://cdn.sqhk.co/tajaketo/hihjhig/17069690977.pdfIn PDF document text
    • https://cdn.sqhk.co/xuwifoviwalo/a0ifm51/directv_packages_cheapest.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468267/normal_60476afbe97b3.pdfIn PDF document text
    • https://cdn.sqhk.co/modesarox/ji0ieHj/christmas_tree_coloring_pages_for_toddlers.pdfIn PDF document text
    • http://kuboduzuke.mypressonline.com/xuvipovifajezetapeg.pdfIn PDF document text
    • http://netekepipavosis.sportsontheweb.net/lejinexikatatowisojik.pdfIn PDF document text
    • http://xitawefavam.medianewsonline.com/ashrae_handbook_fundamentals_2020_si.pdfIn PDF document text
    • https://cdn.sqhk.co/kelanadu/ejdRhdW/buvinofulapevegudodexogon.pdfIn PDF document text
    • https://cdn.sqhk.co/xomifinetepi/h8VUhdl/53182782290.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/95192d01-c7cd-4a67-9513-889b153f404d/how_to_use_nikon_ml-l3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbe2c8ad-7b44-4b2a-ac33-04bef0b1f34b/karosovukekodatoxifiga.pdfIn PDF document text
    • http://zisukuvi.atwebpages.com/xuxarobi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42fddd79-3f0b-4a7f-99e1-63c333b836d8/why_is_my_electric_oven_not_getting_hot_enough.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62f5c598-5f6a-4012-86de-d261a796a43a/how_to_make_text_to_text_connections.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9E 5416 bytes
SHA-256: 3ee8d65dd098dc944341456cb57abeadb80e42c461263ab97ce38e4431e1e32f
font_01_sfnt_off000111f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F5 11040 bytes
SHA-256: 7813a12d528a08cf8e0edf1bde5fb2328c851eee1589d90a9d941303208299d2
font_02_sfnt_off000137cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137CF 16164 bytes
SHA-256: c41fc46809d2260d2d1a821cef6bb00dae560fdbad380da94a93f29d012df54e