Malicious PDF — malware analysis report

Static analysis result for SHA-256 6237066aea308561…

MALICIOUS

PDF

77.8 KB Created: 2021-04-07 18:01:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9338d378bc6a9e163adbd6d91ac59a7 SHA-1: d1a543e338aff711ce613c47fd4f45afb0b7aaba SHA-256: 6237066aea30856131d188ec16e391edee4f845b3f80d494bd57cc573b86a167
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, with a critical heuristic identifying it as a PDF link farm. The primary external URL observed is vilenefex.ru, which is likely part of a campaign to drive traffic or host malicious content. No scripts were extracted, but the PDF structure and numerous external links suggest an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/strik?utm_term=un+poema+en+lengua+maya+corto
    • https://fumaletaseker.weebly.com/uploads/1/3/1/3/131381433/d7f337659c58c.pdf
    • https://serewutedirafam.weebly.com/uploads/1/3/5/3/135339767/difanemotuj.pdf
    • https://sabiwivilo.weebly.com/uploads/1/3/4/3/134316676/7247635.pdf
    • https://dofikusoru.weebly.com/uploads/1/3/4/4/134472045/kazaxan_samebenulupa_fopizupud_dajitabowet.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://5c06e36d-e6a7-492f-989e-88f86e9ca1b1.filesusr.com/ugd/c9ae65_99421fe917d343b2a009cbfc50e9253b.pdf?index=true
    • https://4adff18d-dc39-4349-be2c-eeb12737f1cb.filesusr.com/ugd/9117e0_2ce5440e2a774b4997eb630310841ec3.pdf?index=true
    • https://uploads.strikinglycdn.com/files/94d910ad-39b2-47a8-b9ad-fda95b8e09fd/tenufenufagegelupofema.pdf
    • https://s3.amazonaws.com/jixerubowi/wefexonivotiveduwu.pdf
    • https://s3.amazonaws.com/pirosisob/sadurow.pdf
    • https://c78267de-509c-4cb0-9394-6b21b7876e04.filesusr.com/ugd/290ce3_1690fb675a3f4cc380e92b1c80c37d2d.pdf?index=true
    • https://s3.amazonaws.com/faluzotixupi/zisaraxejavozufidasa.pdf
    • https://064d663d-f6b2-44cf-a6ad-083da5f315e5.filesusr.com/ugd/77eba6_63378fad204a4c5989712bb2a0060a78.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0ce41041-5666-433b-96be-2ac63db9307d/kagalopinokufekifufatibop.pdf
    • https://6cbe2f5c-748b-4bc6-b691-25a968a47885.filesusr.com/ugd/d6b5da_5c83f769751e44a9afab67f9bc109abc.pdf?index=true
    • https://39c1d623-eccb-4af0-a86a-15328a2d61f9.filesusr.com/ugd/3cb6cb_2ddfc19cb78341dd950d74f90683cf92.pdf?index=true
    • https://f904ef53-caa1-4f0f-8a97-c50675c03ece.filesusr.com/ugd/2f8cea_7a3f2060ee4641b7896609025c316123.pdf?index=true
    • https://4a5660cc-52a2-48ff-9acb-4b4f1704cb6e.filesusr.com/ugd/81868d_34cdee189d5f476199d8e1142f274143.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4dcbada4-a278-4863-96d0-c10c1cc4d35d/genie_wet_dry_vacuum.pdf
    • https://s3.amazonaws.com/bejikefowu/26969597913.pdf
    • https://58552d80-c20c-4e4f-99b9-91bedbcc07a3.filesusr.com/ugd/c18496_f098d7c29eef44c8ae1a42dcebda8ff9.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2b1ef9de-f971-4236-bda5-4e132f9b17b4/gapagaz.pdf
    • https://s3.amazonaws.com/dutimajizowa/2092787123.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_off0000efb8.bin
2ac6cc037e504fe285fb4c9b9af3a397f2ae78ab898f53176527506efdc56529		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB8 5168 bytes
font_01_sfnt_off00010141.bin
7ca082d2a6af158c8acd7567a2f19b8052a70e9b0bf02bad71ad1fa1c493cc13		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10141 12084 bytes

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