Malicious PDF — malware analysis report

Static analysis result for SHA-256 162cba7f7281c1cd…

MALICIOUS

PDF

89.7 KB Created: 2021-04-16 17:12:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: dcce9fd7782386d4ff54a06b3cfc3707 SHA-1: 2515ea99e0cf39daec6fc595c5570e84469e081c SHA-256: 162cba7f7281c1cd97fc1f9f4f84588a07a47e01033df048eb23385646a1f8eb
186 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many pointing to disposable hosting services, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically related to phishing. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of an attempt to redirect users to malicious or deceptive content.

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://gimoguvi.ru/strik?utm_term=leyes+laborales+puerto+rico+vacaciones PDF link annotation
    • http://lusoxokurutugap.22web.org/jozesesilaxosujubewar.pdfIn PDF document text
    • http://zasoremejoka.iblogger.org/rockstar_full_movie_300mb_free_filmywap.pdfIn PDF document text
    • https://vabinori.weebly.com/uploads/1/3/4/3/134348027/waferi_gosedow_tigudatuxali.pdfIn PDF document text
    • http://kajejib.medianewsonline.com/zubiwagaredi.pdfIn PDF document text
    • https://guxesawaxogego.weebly.com/uploads/1/3/4/3/134314991/gozadur.pdfIn PDF document text
    • https://tivifetanesa.weebly.com/uploads/1/3/5/3/135347176/lamudimuduzal.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4993f9ff-345c-4c03-a8ec-d4f8dac664d6.filesusr.com/ugd/debbe1_ee5c2c2b2e0d43b280101e5bfe25311a.pdf?index=trueIn PDF document text
    • https://ad9f1622-e3b7-49db-bfef-326c48fb2104.filesusr.com/ugd/a467d2_a1909b00469944189f3b8965465e3cb0.pdf?index=trueIn PDF document text
    • http://suronatuxi.rf.gd/belinda_bauer_snap.pdfIn PDF document text
    • http://riluromeni.epizy.com/baremumigezosexotej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4aa2ca4-a5f7-425f-a59e-987b9974dd4c/90129388713.pdfIn PDF document text
    • http://bexituxupogetav.rf.gd/6118418872.pdfIn PDF document text
    • http://disupenepoka.epizy.com/saucony_men_s_guide_iso.pdfIn PDF document text
    • https://709e7e89-b264-4d73-b757-064736ed86f1.filesusr.com/ugd/f523c3_76544ab3cb7d4f698b2c51501e4471f3.pdf?index=trueIn PDF document text
    • http://tawadamaripiz.rf.gd/52579290313.pdfIn PDF document text
    • http://pusolegulijased.rf.gd/fowuwazigusezafevukug.pdfIn PDF document text
    • http://nefaped.epizy.com/sofajuxene.pdfIn PDF document text
    • http://kuwitabetegipo.myartsonline.com/mahalaxmi_calendar_2020_marathi_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3fd62d3-b080-42a3-8de9-f9b4ec4cb3eb/bulk_crossword_puzzle_books_for_seniors.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54826b5a-dcf2-4816-9378-01520ba7323c/55249755689.pdfIn PDF document text
    • https://1dab3517-3db0-43ff-9fd6-b65b51f65b60.filesusr.com/ugd/565485_a4e75d0fbf68405eb2f888466f6a607e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8f64316-165a-47d8-a8e4-d1c36cd4cc29/32333602245.pdfIn PDF document text
    • https://621cd70f-1aca-46de-91df-1bd8162c3e90.filesusr.com/ugd/9f1ad6_fbb674e478984b5b9d2857a6b8d41559.pdf?index=trueIn PDF document text
    • http://jonatabofozepov.epizy.com/ethiopian_reporter_news_in_amharic_in_in_archives.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_off00011b00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B00 5168 bytes
SHA-256: 1a5583162a28d7c196a7945a4802236ca3583e66c03cb446b122d4a1ff8415ba
font_01_sfnt_off00012cb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB1 13272 bytes
SHA-256: 28ee91e518fe3b416d431f6f66df5effe5cbf84e3a4636313ee4e12fb2382999