Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1acf373d1e222cc…

MALICIOUS

PDF

73.3 KB Created: 2021-01-23 05:32:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: a496d889f3dbc86253c047a6f52cdfd6 SHA-1: d0c68de0aba62dd9212788d3556832dda0e56432 SHA-256: b1acf373d1e222cc55fd7e6fb9633d1b46039af9ec79d26511502eeb1c4f3a6b
96 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ClamAV and an ML classifier. It contains an embedded URL that impersonates a Google Forms sign-up sheet, likely to trick users into visiting a phishing site. No scripts were extracted, but the PDF structure itself facilitated the embedding of the malicious URI.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jottigo.ru/aws?utm_term=google+forms+sign+up+sheet+limit PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366958/normal_5fe827af37a52.pdfIn PDF document text
    • https://site-1237802.mozfiles.com/files/1237802/frases_adverbiales_en_ingles.pdfIn PDF document text
    • https://cdn.sqhk.co/takejirasomu/agihhPI/vikizumujeberofalo.pdfIn PDF document text
    • https://cdn.sqhk.co/bofogarabu/Ijc77hh/48986508380.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416919/normal_5fe1ca529577d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452609/normal_5fed344036746.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455657/normal_5fe49650ef8b9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369183/normal_5fe24fc9c0ef1.pdfIn PDF document text
    • https://cdn.sqhk.co/tifesijoja/njhjgib/5693981116.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/kimone/jai_bajrangbali_ka_photo_ing.pdfIn PDF document text
    • https://s3.amazonaws.com/fonibinaraj/tafolirolurivosem.pdfIn PDF document text
    • https://s3.amazonaws.com/penefelomiju/kapixivalegupezunako.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_off0000d4c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C7 5016 bytes
SHA-256: f87b33c7d194d56add31fdd63a03af03a784af88cf9612a5f7b18575eac3b594
font_01_sfnt_off0000e5b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B8 10656 bytes
SHA-256: 63fffeacb42087dc77d5621040fa7be3858fa8bc351626d3b953a2337c793fa7
font_02_sfnt_off00010a19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A19 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e