Malicious PDF — malware analysis report

Static analysis result for SHA-256 658efe356c4b0600…

MALICIOUS

PDF

74.0 KB Created: 2021-03-22 06:41:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca5ff6b84dda92361d785de193d8441f SHA-1: 283ecbc48dd1921213bdb435db06de2f780fedc6 SHA-256: 658efe356c4b06009c50c45d02687923810a040a1f90a4a5720a62fbad42f49f
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains or link farms, indicating a likely attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest a phishing or malware distribution vector, potentially leveraging embedded JavaScript for malicious actions.

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://maypoin.ru/wix?keyword=free+printable+blank+keyboard+worksheet
    • http://banademebilite.sportsontheweb.net/lorusokat.pdf
    • http://copyrightnotice-ig.com/97110895450dbt54.pdf
    • https://lasapiboxemifol.weebly.com/uploads/1/3/4/8/134865682/e03059c3bbc.pdf
    • http://vuvodagedene.scienceontheweb.net/gmat_official_guide_online_login.pdf
    • https://vigenawora.weebly.com/uploads/1/3/4/4/134495248/jusuribamop.pdf
    • https://cdn-cms.f-static.net/uploads/4419629/normal_601aa8187e8f2.pdf
    • https://cdn-cms.f-static.net/uploads/4467576/normal_5fe94d2a2c16c.pdf
    • http://kwini-fini.online/zibilumijoxi9yz1l.pdf
    • http://vetebozo.mypressonline.com/kudimoluzutod.pdf
    • http://copyright-central-media.com/fetufijuxijoluberalizayd4ov.pdf
    • https://pimuvetu.weebly.com/uploads/1/3/4/6/134635596/b693a6.pdf
    • http://fazejajogavu.medianewsonline.com/wazikog.pdf
    • http://creditinquiry.info/do_leases_automatically_go_month_to_month54de6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/400f0b23-ab87-4cff-9da8-4b8a47a09494/java_8_stream_map_collect_example.pdf
    • https://uploads.strikinglycdn.com/files/d072e4c5-93e7-4f7b-9dcc-333d185c81b6/54135396511.pdf
    • http://biburusig.myartsonline.com/accessory_to_war_free.pdf
    • https://uploads.strikinglycdn.com/files/ee20657d-b93f-4953-a72b-13da200562a2/dajotabudiximukarukuk.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e35c.bin
731e5747288e17bbbb493982e8aa4c4a59c9e84f4a2fe78ea10554d225920fcb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE35C 5400 bytes
font_01_sfnt_off0000f5c1.bin
97aa9ddb22bb04b15fe7b09d26ed0c6145a23ad6b65138b7b63cb8440912da52		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C1 10828 bytes

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