Malicious PDF — malware analysis report

Static analysis result for SHA-256 190fbce6dab78f8a…

MALICIOUS

PDF

74.6 KB Created: 2021-02-25 12:42:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: fadd59f990e4863374df8300b2d5f025 SHA-1: 1c8eb505c2a3d9aa7aff1305141c2e7271ae94f3 SHA-256: 190fbce6dab78f8a66994d303cb2cd589daa43f867bf7087e09b0dcbf3db29a3
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with heuristics indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/wb?keyword=how%20do%20i%20get%20network%20security%20key PDF link annotation
    • http://nabavawuzafurur.mygamesonline.org/navulix.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466154/normal_5fd071771e70e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449184/normal_5fc5cf89c8cfe.pdfIn PDF document text
    • https://zigibopujomez.weebly.com/uploads/1/3/5/3/135350997/xinimilejukoz.pdfIn PDF document text
    • http://xuzerujagojagip.scienceontheweb.net/ziwekeruzoxotewozegi.pdfIn PDF document text
    • https://juwujumatel.weebly.com/uploads/1/3/4/0/134042908/gekuzadozu_wozijijig_sibomunofa.pdfIn PDF document text
    • http://psychologyrelax.xyz/lego_hidden_side_fire_truck_release_datek68bq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427268/normal_601ba1f9507ff.pdfIn PDF document text
    • http://autocredit.moscow/8886279381ngaxc.pdfIn PDF document text
    • http://biomanuawebsiteua.xyz/insanity_flyff_blue_chips_guidew10w6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474980/normal_5fc6b767d38c1.pdfIn PDF document text
    • http://eslivdrug.space/partituras_de_banda_marcial02unj.pdfIn PDF document text
    • http://wewogokuwidu.mywebcommunity.org/wd_my_cloud_asking_for_name_and_password.pdfIn PDF document text
    • http://fb-copyright-help-from.com/bufatuxisumurakaloluxepujx422k.pdfIn PDF document text
    • http://onlyforyou.space/forklift_training_requirements_albertau1o22.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e7c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C2 5084 bytes
SHA-256: 46d398756cc281264edb4e688c46d303169ddfb77d3f3cd18f255f3a8d0d2839
font_01_sfnt_off0000f93e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93E 10604 bytes
SHA-256: 98824870d7d7d16fd9f8abddcb652b7b1f2d04af3867795fff9136364504da5f

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