Malicious PDF — malware analysis report

Static analysis result for SHA-256 81b8251f8e3e60c6…

MALICIOUS

PDF

75.8 KB Created: 2021-01-11 06:03:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: d4c93ac4aa8f90a5d91bac58c3ea260a SHA-1: 473cc8798a42f6a16a38aaf041d566fa8da0f6b6 SHA-256: 81b8251f8e3e60c6d85d90e3ebd2009190eaed54b1f55650d739e9b86a411015
96 Risk Score

Malware Insights

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

The file is a PDF document flagged as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains an embedded URI pointing to 'trafffi.ru', which is likely used to redirect the user to a malicious site. Although no scripts were explicitly extracted, the PDF structure and the nature of the embedded URI suggest an attempt to exploit the user's trust for malicious purposes, possibly through a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffi.ru/wb?keyword=mens%20hairstyles%20wavy%20hair PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387424/normal_5fbb1837bacb0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425504/normal_5fbe0ccb8fbad.pdfIn PDF document text
    • https://cdn.sqhk.co/dosakupu/gjbij4g/minecraft_plants_vs_zombies_mod_crafting_recipes.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368772/normal_5ff7ab6074c65.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374857/normal_5fdc339945c79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459182/normal_5fa5968210cf4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484820/normal_5ff3e4a4470d3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483856/normal_5fdea3447f0a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366028/normal_5fd0c1eec93b5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379855/normal_5fc75bba371be.pdfIn PDF document text
    • https://cdn.sqhk.co/gabisolovima/7pKd0if/red_button_up_dress_collar.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/likadojivivofu/dizape.pdfIn PDF document text
    • https://s3.amazonaws.com/bubodeliza/jak_zjistit_wifi_heslo_android.pdfIn PDF document text
    • https://s3.amazonaws.com/rowubunak/58825641548.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D1 4708 bytes
SHA-256: 60f90e88adc478fdccae4955a3f00c4af040d79fec4bb11715c95243891f6bf3
font_01_sfnt_off0000f1d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D0 10260 bytes
SHA-256: 1d70c7393ae521b4e6d423716c60a5dd2292463d6c736a193fdbbb404abaa6de
font_02_sfnt_off000114a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A0 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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