Malicious PDF — malware analysis report

Static analysis result for SHA-256 240d97bfb0e11d9c…

MALICIOUS

PDF

72.0 KB Created: 2021-03-23 16:28:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 654777af41eb609274c4f94cbe387819 SHA-1: 86f7cddcadd78d66a02b14944c0a9e8c653b84a9 SHA-256: 240d97bfb0e11d9c4f4e598dbd75ba5f67441c45ca12ca2df0175c29739ac86c
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged as malicious by ML classifiers and ClamAV, specifically identified as a credential phishing lure impersonating Facebook. It contains multiple external URIs, including one pointing to a link farm on disposable hosting and another to a Weebly-hosted PDF, which likely serves as the phishing landing page. The document body is heavily obfuscated and unreadable, but the heuristics strongly indicate a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://fodubimofo.weebly.com/uploads/1/3/4/8/134884763/64123673112.pdf.
  • 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://pelibifir.ru/wix?keyword=mole+ratio+worksheet+chemistry PDF link annotation
    • http://my-favshopg.online/paxemixineroxi2qk1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407724/normal_60203189e8c11.pdfIn PDF document text
    • http://gagivukamuw.getenjoyment.net/java_head_first_github.pdfIn PDF document text
    • https://fodubimofo.weebly.com/uploads/1/3/4/8/134884763/64123673112.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453329/normal_603a692df17fb.pdfIn PDF document text
    • http://kinemulawaw.sportsontheweb.net/kodamoguzojodupu.pdfIn PDF document text
    • http://polystate.ru/69284709039qmqu9.pdfIn PDF document text
    • https://zuzilumapodebaj.weebly.com/uploads/1/3/1/3/131382406/mofikolekado.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445743/normal_60551f7144d0f.pdfIn PDF document text
    • http://nexofozupugasi.mywebcommunity.org/icebreakers_for_kids_online.pdfIn PDF document text
    • http://kulinar2020.site/xowolidanolama2nib7.pdfIn PDF document text
    • https://doxemikawapuki.weebly.com/uploads/1/3/4/3/134314999/7739530.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa0ae2d9-bb7a-4d33-abd0-a8579dfcde5d/lofejakarigalugojagobuzol.pdfIn PDF document text
    • https://eee5dff6-7331-416e-acdf-593d0c386862.filesusr.com/ugd/21e9e0_ee2771f663a349e78229c2d2dd49f8a9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8702d0ba-2c3d-466e-b8bf-c79714fee936/hebrew_word_for_captivity.pdfIn PDF document text
    • https://332892e0-6a2b-40ad-946e-e7c92c61c867.filesusr.com/ugd/3e5d97_112dbdb554fc45e9b5d19cbfbf581e28.pdf?index=trueIn PDF document text
    • https://101c3d73-5e22-4da1-a203-a3a2a794ce88.filesusr.com/ugd/69a512_693567bf9ec04bb59a7fefca4b2c6e87.pdf?index=trueIn PDF document text
    • http://sujunutab.atwebpages.com/cadiz_constitution.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2194bb4d-6da4-41f1-aa35-5cf8565f3b36/jelafolilubenupurisox.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_off0000ddef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDEF 5304 bytes
SHA-256: 3d5b5f80df60ebcbd0740b9080c82a65d34e023353637d38b108ad1cc61b11e9
font_01_sfnt_off0000efed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFED 10304 bytes
SHA-256: 618a15b3e97e64bea3b380a2a9cffcb7d5d0da813b0cdaf76c7ebb6efb88b619

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