Malicious PDF — malware analysis report

Static analysis result for SHA-256 a86cf8b598875129…

MALICIOUS

PDF

187.8 KB Created: 2021-04-21 14:03:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: eade38503a5cb345e62e9449745b3eb4 SHA-1: 650d0238a972d78cf5990379ba7ad89a9228c26b SHA-256: a86cf8b59887512968db92ca0bf62756ab6e7037149f2dfd689e9d193f8c8759
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs and is flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm on disposable hosting, suggesting an attempt to obscure the final destination. The ML classifier also strongly indicates maliciousness. While no scripts were explicitly extracted, the presence of many external URIs points to a redirection-based attack, likely for phishing or to download further payloads.

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://maypoin.ru/strik?utm_term=how+to+understand+molecular+geometry PDF link annotation
    • https://cdn.sqhk.co/luwukamuku/hjahibj/xijasedobuwum.pdfIn PDF document text
    • http://momarivido.mypressonline.com/midil.pdfIn PDF document text
    • https://cdn.sqhk.co/kafexobesa/igjhc5t/guess_the_anime_quizzes.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446772/normal_5ffdb6afdff25.pdfIn PDF document text
    • https://cdn.sqhk.co/kigaratak/PMic4vZ/cat_runny_nose_and_eyes_sneezing.pdfIn PDF document text
    • http://limevekobo.iblogger.org/48_thermador_refrigerator_for_sale.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365620/normal_600f57a818db9.pdfIn PDF document text
    • http://gojevomarokabe.getenjoyment.net/55893219497.pdfIn PDF document text
    • http://kuvenumine.mygamesonline.org/48982903632.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415934/normal_6051bb9c2f08f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tamikukezinubi.rf.gd/35260160904.pdfIn PDF document text
    • http://muvemaxadal.onlinewebshop.net/patofisiologi_dermatitis_atopik.pdfIn PDF document text
    • http://lewimidofi.epizy.com/wapking_full_bollywood_movies_hd.pdfIn PDF document text
    • http://likamufibunefar.epizy.com/ragal.pdfIn PDF document text
    • http://makakanow.onlinewebshop.net/celik_wang.pdfIn PDF document text
    • http://gukasitaxe.epizy.com/luzaregan.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawe/dawson_and_amanda_the_best_of_me_all_of_me_lyrics.pdfIn PDF document text
    • http://jukasuxoseki.atwebpages.com/83984915731.pdfIn PDF document text
    • https://s3.amazonaws.com/baxegezivumi/arduino_uno_dimensions_drawing.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_off0002a0bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A0BF 5416 bytes
SHA-256: 4ba2f3466262165aa4747a4c06b889a97eafb557ca4b0205f075e60f2cdb9559
font_01_sfnt_off0002b328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B328 14576 bytes
SHA-256: 26d1161844a7b4db05d5710aa7300125ab6ba4088abba7807e1b7f3d4ae318e3

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