Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aa3fe556668918e…

MALICIOUS

PDF

82.3 KB Created: 2021-03-08 08:46:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 79e81eca951669e687376d3e67073574 SHA-1: 4a5ce221c5340ce5e022d77c68946dfd7e719c5f SHA-256: 4aa3fe556668918e9293960cf99d786e98d5c116dbcae7ae4542a7053205ec97
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, many of which point to disposable hosting and are likely part of a link farm designed to redirect users to phishing or malware distribution sites. The PDF's structure and embedded links suggest it is used as a lure, likely in a spearphishing campaign, to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://bologen.ru/strik?utm_term=planificacion+estrategica+de+una+empresa+ejemplo+pdf PDF link annotation
    • http://timujegewaverun.22web.org/sorebiwawuniwa.pdfIn PDF document text
    • https://cdn.sqhk.co/gemadaruvow/72Pia17/start_your_own_wedding_planner_business.pdfIn PDF document text
    • https://cdn.sqhk.co/mizogujuzo/jahjehe/monzo_digital_model_builder_mod_apk_android_1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403130/normal_5ff94268ae331.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454432/normal_5ff06dce23909.pdfIn PDF document text
    • http://sixuvuwafow.22web.org/stanley_fatmax_6ft_spirit_level.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500669/normal_5fdcee17633f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447079/normal_603340db58eed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383131/normal_600ce24032f9e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454047/normal_5fe0543f4b497.pdfIn PDF document text
    • https://cdn.sqhk.co/tokarikadez/jeieGqM/32364964645.pdfIn PDF document text
    • https://cdn.sqhk.co/dufimogemeka/jcO3khb/14748492522.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368228/normal_5fefa1294d951.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486215/normal_6026490c4d3d5.pdfIn PDF document text
    • https://cdn.sqhk.co/taxeseta/bIBiikT/pseudo_democracy_meaning_in_urdu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wexoloxi.rf.gd/android_studio_3._1_gradle_console.pdfIn PDF document text
    • https://s3.amazonaws.com/bamepofewalada/sudimusu.pdfIn PDF document text
    • https://s3.amazonaws.com/fikuvine/cover_letter_format_for_jobs.pdfIn PDF document text
    • https://s3.amazonaws.com/zabevog/58056687901.pdfIn PDF document text
    • https://dda5c79a-a75d-44d9-a006-48dec3bfe172.filesusr.com/ugd/115d6e_5dcc28e6233945f8a0caf29db239e1d5.pdf?index=trueIn PDF document text
    • https://d992f69e-bc5b-430a-92d7-abfd66d0380b.filesusr.com/ugd/6f7357_1e6df160482d4b75bd065b4dd60cd86c.pdf?index=trueIn PDF document text
    • http://zifiroduvibo.rf.gd/56418374201.pdfIn PDF document text
    • http://muvuxuduxe.epizy.com/gumikosivumufivubixuw.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_off000101c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C6 5552 bytes
SHA-256: ebe55e6c9bc00d687a2adbf6a2d67d4330e9757b2a9cecff281a18e8af0a591d
font_01_sfnt_off0001149b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1149B 11432 bytes
SHA-256: 861dc852bcc4e6bf33d546d8cdec3cb855884e66c161a8a9d31ca763bda84f52

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