Malicious PDF — malware analysis report

Static analysis result for SHA-256 981cb986a5840c85…

MALICIOUS

PDF

79.3 KB Created: 2021-01-25 20:45:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 672459d9aa29dc6b324ce0360e3b7afd SHA-1: 97583d9feab0c254f2bf25340113f4c790f032a9 SHA-256: 981cb986a5840c85460bcdb438a64e0a8bdbe484943a5e19bf9337c893e9fdfc
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, with a notable heuristic identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the document body's structure, despite being heavily obfuscated, point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/123?utm_term=breaking+benjamin+acoustic+album+release PDF link annotation
    • http://vuzopozakobepe.22web.org/34428502126.pdfIn PDF document text
    • http://gakivako.iblogger.org/55816670488.pdfIn PDF document text
    • http://findssldz.xyz/stokke_tripp_trapp_newborn_set_agejq8on.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426822/normal_5fc8495076d7c.pdfIn PDF document text
    • http://gofipupeseg.22web.org/corazon_ang_unang_aswang_free_movie.pdfIn PDF document text
    • https://mivatuvogap.weebly.com/uploads/1/3/4/0/134040868/754375.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://wabelat.epizy.com/period_stains_on_hotel_sheets.pdfIn PDF document text
    • http://goguvero.epizy.com/pap_smear_screening_guidelines_acog.pdfIn PDF document text
    • http://mudalulox.epizy.com/functions_of_criminal_law.pdfIn PDF document text
    • http://lawazujazigefon.epizy.com/90397929098.pdfIn PDF document text
    • http://sedinuposib.rf.gd/33284037268.pdfIn PDF document text
    • http://tovajukoxeboder.epizy.com/solubility_curve_worksheet_chemistry.pdfIn PDF document text
    • http://kitalanexu.epizy.com/dazizawabariragidixojewaz.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA77 5328 bytes
SHA-256: 807367fbb0cb345457b4bb7cbb728514e095157c775d3bc749482e8fb32055b5
font_01_sfnt_off0000fc83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC83 11004 bytes
SHA-256: 43e20f6a96982ebeb4b5693004f46b26ef8520dd5aa38576728e4f9c4744eae6
font_02_sfnt_off000121e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E6 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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