Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c8634df80f682a5…

MALICIOUS

PDF

72.3 KB Created: 2020-12-04 04:35:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: e85523b8a4091dcbbb1853ec9cb10ad7 SHA-1: bebd208de9c0eca4a263328542d2496a25973370 SHA-256: 1c8634df80f682a5e139673131f239813ce09e8f1d49e20f8b838e5a8334b445
96 Risk Score

Malware Insights

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

The file is a PDF document flagged by ClamAV and an ML classifier as malicious. It contains an embedded URL pointing to 'traffset.ru', which is likely used to deliver a malicious payload or conduct phishing. The document body, though heavily obfuscated, suggests a lure related to 'Coffee cup calorimetry problems', indicating a potential attempt to deceive the user into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://traffset.ru/strik?utm_term=coffee+cup+calorimetry+problems PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366402/normal_5fa58cc8459a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370078/normal_5fc2b2566f215.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393361/normal_5f91b99c08a8a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445325/normal_5fbce7c1d341d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366343/normal_5f923ea99e2b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412158/normal_5f969a8350a10.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://uploads.strikinglycdn.com/files/adaa32fa-ab37-4802-b261-145fc2a8029d/debubeginopabilerukimij.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/6808524881.pdfIn PDF document text
    • https://s3.amazonaws.com/woberiz/xilisoft_video_converter_free_filehippo.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0d900d26ff1194f736c6f/t/5fc42b28145a8629dc34229b/1606691626076/come_to_me_lyrics_village_church.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc4d1fde5c7695ca9b4aca3/t/5fc6de7a7995075abdd2be6e/1606868602951/nigarujufitosi.pdfIn PDF document text
    • https://s3.amazonaws.com/genukopapovixo/lefikonuzekutogudo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d85c289e-107a-4c71-8920-bcb1480ead76/myfitnesspal_not_syncing_workout.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_off0000cfa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA2 5204 bytes
SHA-256: a75df07c5531c4b30d11457172b483cbda1f160ef5dbd73bf339984f1c896864
font_01_sfnt_off0000e168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE168 11100 bytes
SHA-256: ceb200c1b927641914548cc5907808e798e96e566d18d8ac09f8a5d0fab29ca9
font_02_sfnt_off00010679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10679 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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