Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1fba0859dcc5242…

MALICIOUS

PDF

81.0 KB Created: 2021-03-16 05:57:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 3620fb83cd0a66dff1e480960730b4f0 SHA-1: 2907095728a3e69d10cb686547b3b6f517b9da02 SHA-256: d1fba0859dcc5242eb43e5e93176309417decb06696de85306883bc737468d83
186 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to disposable domains, suggesting a link farm or SEO spam operation. The embedded URL `https://mezovuduw.ru/wix?keyword=what+caused+the+civil+war+yahoo+answers` and the presence of a link farm heuristic indicate a malicious intent to redirect users to potentially harmful content. ClamAV also detected this file as `Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0`.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://mezovuduw.ru/wix?keyword=what+caused+the+civil+war+yahoo+answers PDF link annotation
    • http://1freedom.space/bhole_baba_photoskkw1l.pdfIn PDF document text
    • https://rajepejejema.weebly.com/uploads/1/3/4/8/134860913/4442f158.pdfIn PDF document text
    • https://cdn.sqhk.co/kaxonavi/8GANVhX/dj_music_mixer_free_download_for_mac.pdfIn PDF document text
    • https://cdn.sqhk.co/lezebulodiw/fhhKr3y/sasozonoxiwarokiriva.pdfIn PDF document text
    • https://xezinaruwi.weebly.com/uploads/1/3/4/4/134479948/wijew_newave.pdfIn PDF document text
    • https://cdn.sqhk.co/zadexona/brchbhc/football_team_president_salary.pdfIn PDF document text
    • https://pekubitox.weebly.com/uploads/1/3/4/4/134477952/ba30e.pdfIn PDF document text
    • http://shoppingyxplus.xyz/beretta_92fs_air_pistol_manualg5hsk.pdfIn PDF document text
    • https://tokemenar.weebly.com/uploads/1/3/4/3/134337898/fevinigeju.pdfIn PDF document text
    • https://peniwifagupe.weebly.com/uploads/1/3/0/7/130738894/4256842.pdfIn PDF document text
    • http://begdas.fun/panasonic_microwave_service_manual8idg7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9f349447-249b-4747-956a-316fe86e371b.filesusr.com/ugd/d2b720_d73e7acded994897897af0a1b3fe1716.pdf?index=trueIn PDF document text
    • https://0dd4521b-3e41-4083-9bcc-807cce03ae78.filesusr.com/ugd/cfe2e9_3fe55a3fafa14e6b8ca9250c6d390917.pdf?index=trueIn PDF document text
    • https://070488ba-e3d9-4c74-834b-445551f5513c.filesusr.com/ugd/fb83f1_d96910a4d0fe4246bed47e6e9e1ddf3b.pdf?index=trueIn PDF document text
    • https://153f2bed-3501-4ec5-9468-ed1987511f6d.filesusr.com/ugd/f67134_e51ab42b4df54f1fbd4e57fb8b66eac7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcad48ed-9b25-4e85-b451-65c4c7b08143/golden_harry_styles_original_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7bfee5a-12e9-449a-a341-d37516a421d5/pebinifotatunexakoremaf.pdfIn PDF document text
    • https://29ce6865-365c-47c4-9f0a-635d6f965865.filesusr.com/ugd/0d6b77_ea8ab4015f144ee9a758427e07573df8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3d2e8f7-662c-4937-96a2-6792ce806068/dugar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f93cf07-bb1e-44aa-a3ba-4db0ea7bb658/gasubuf.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001002a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1002A 5296 bytes
SHA-256: 3aca930a3b3e1e0cc052030bed9e5d1bb06f597e680cbc91a78c3d9537667daf
font_01_sfnt_off0001123f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1123F 10688 bytes
SHA-256: 8d66b9572b36672f643832b5715170bfb1a250f0daf5f75385bf31bea5a6735f