Malicious PDF — malware analysis report

Static analysis result for SHA-256 def4ef492f621bbb…

MALICIOUS

PDF

75.9 KB Created: 2021-03-12 15:50:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: ee64cf370e7029c98e030e1c37a470b1 SHA-1: ed297eae518094507263a6dd9a76a00249296c3d SHA-256: def4ef492f621bbb969026afae88e643a15cce1c978e7dcf7178be1edcccb489
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous external URIs, many pointing to disposable hosting, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, appears to be a pretext for directing users to external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jottigo.ru/strik?utm_term=how+to+use+a+fender+mustang+ii+amp PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4480399/normal_601717970eca9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453579/normal_6047f43d9f43b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375076/normal_60187882e1c3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483833/normal_5fd981a11ef3c.pdfIn PDF document text
    • https://nezokamovijemi.weebly.com/uploads/1/3/1/8/131856769/dubedadumu_lifoninatanane.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370304/normal_603014ffb52f0.pdfIn PDF document text
    • https://mipolapepel.weebly.com/uploads/1/3/4/3/134395859/8391193.pdfIn PDF document text
    • http://meetsol.xyz/xumozefinamazopunexefus97hm6.pdfIn PDF document text
    • http://rawenspant.online/wugokirevojidenigewidp7xit.pdfIn PDF document text
    • http://milanomoda-italy.website/gisorodogerzvj2u.pdfIn PDF document text
    • http://jugonosimov.22web.org/1049090395.pdfIn PDF document text
    • https://pawudovavumub.weebly.com/uploads/1/3/1/4/131411600/f4caa42.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rikukevez.rf.gd/naxofawekosinozijibegesa.pdfIn PDF document text
    • https://d451e762-8e00-4155-9971-9512d28d2528.filesusr.com/ugd/b52961_bfe60b57471a4ba5a1873c0750a1632c.pdf?index=trueIn PDF document text
    • https://4993f9ff-345c-4c03-a8ec-d4f8dac664d6.filesusr.com/ugd/debbe1_debdf72bc7d447f6a135b08b1e76cbb7.pdf?index=trueIn PDF document text
    • https://be8414c4-f2d5-40c6-b8a8-1a5561a1dac7.filesusr.com/ugd/a452ea_6d86522ba2fc47588211d0148a42c995.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/figugipopar/best_offline_football_games_for_android.pdfIn PDF document text
    • http://suvubojetixag.epizy.com/3799928145.pdfIn PDF document text
    • http://xufojeji.epizy.com/romeo_and_juliet_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/dipafuxe/merabefavafosimal.pdfIn PDF document text
    • https://s3.amazonaws.com/webipejonavuv/ms_project_free_learning.pdfIn PDF document text
    • http://mosupemerumen.rf.gd/fegubiwesojaf.pdfIn PDF document text
    • https://s3.amazonaws.com/magapeguwabe/oxford_english_phonetics_dictionary_free.pdfIn PDF document text
    • https://s3.amazonaws.com/wufujudisu/62709848459.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_off0000e9d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D5 5380 bytes
SHA-256: dc5b53e1542a7203f780c7fcc443f82bd117d17ae7846d3abfdc7d17beb0ecc8
font_01_sfnt_off0000fc22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC22 11136 bytes
SHA-256: cbfb3cdc666a512788496713af9252349e5f494b4b148e446dd541ddff105766

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