Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7f9cc82ae52b398…

MALICIOUS

PDF

139.0 KB Created: 2021-04-25 14:59:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 0b0454794588ee1d91f92d34a8df8ad6 SHA-1: cd370b8b6022e04fb35001067e62133f3f8adc7f SHA-256: b7f9cc82ae52b39885a647e530f11b281c4aa221ce38d7114c88a1e89f4ee8b8
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and a heuristic specifically flags it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/strik?utm_term=libro+de+calculo+integral+dgeti+resuelto PDF link annotation
    • http://povidusajis.iblogger.org/41524467672.pdfIn PDF document text
    • http://lnstagramverifiedbadgeshelpcenters.net/bitinebaguwamelegulifik27oym.pdfIn PDF document text
    • http://sportita.fun/91602736828d47j0.pdfIn PDF document text
    • http://newberginvestmentproperty.com/69782570523qrrby.pdfIn PDF document text
    • http://gsmall.space/style_italiano_rubber_daml5k80.pdfIn PDF document text
    • http://getchambre.xyz/364460817765vq2j.pdfIn PDF document text
    • http://begdas.fun/business_card_design_template_online1m63h.pdfIn PDF document text
    • http://hihikane.space/2526958270lvkw0.pdfIn PDF document text
    • http://rogemuso.iblogger.org/nepodi.pdfIn PDF document text
    • http://boost-store.net/zukumyao2d.pdfIn PDF document text
    • http://visobewitumimek.22web.org/7806513654.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jojixeme.rf.gd/98444986065.pdfIn PDF document text
    • https://e8677ced-6330-435e-8237-200fb10408a4.filesusr.com/ugd/a4c1fa_c464c77029f04458a81e2111ac7316dc.pdf?index=trueIn PDF document text
    • https://a3de454e-1598-42bb-a259-4eb69c42f179.filesusr.com/ugd/fb5067_91023c0dcdba48d19840cad71e5048fc.pdf?index=trueIn PDF document text
    • https://619c993e-e215-4b07-891b-88776ecab8c8.filesusr.com/ugd/1fce43_e3bd314a74f24b11a908c9bf9bcea799.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9502a9f5-3c5e-4a66-8131-16f6753fae72/49704831589.pdfIn PDF document text
    • https://200ee3fc-349d-4871-b5c3-2c1c69b60476.filesusr.com/ugd/7b00a0_6144dbdec1d04afca19496487e80995c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b375c589-6a93-406d-bd94-4e5d5d717c43/what_is_naviance_in_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c03d6d9c-8fa2-4076-9d3b-223579124306/formula_to_calculate_principal_stress.pdfIn PDF document text
    • https://486bfeb6-87d8-40a3-812f-3449909c9139.filesusr.com/ugd/81b904_9d2a3ad6d8ed4bb3ba6532d904b84e13.pdf?index=trueIn 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_off0001c9b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C9B9 5188 bytes
SHA-256: 93c53c4390065d1a0c30d37097dae0532cd0f5b2340ae97c87b9a9f70a8eb954
font_01_sfnt_off0001db6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DB6A 13944 bytes
SHA-256: 47c7e517e277d018cf93506bf706c9a7b74f80f53c53ceae368248d6c6b554c4
font_02_sfnt_off00020802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20802 16276 bytes
SHA-256: 0029d09808e47322126c4ad901533e883d53aec70b58267afdbe80baf531719c