Malicious PDF — malware analysis report

Static analysis result for SHA-256 3512ded6d0ca0598…

MALICIOUS

PDF

68.6 KB Created: 2020-12-22 22:17:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: ffc731a089a770b9e5a860953f073df5 SHA-1: a032679d381eda180ee7322ecc0c1e2bcb27c932 SHA-256: 3512ded6d0ca05988163ef022e8f189c4192ee5958e3e6b99a757c69bafa83c1
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and ClamAV, with the latter identifying it as Pdf.Phishing.Trojan. The embedded URL, 'https://trafffi.ru/aws?utm_term=update+android+samsung+galaxy+a8', strongly suggests a phishing attempt, likely disguised as a software update notification to trick the user into clicking it. The document body, though heavily obfuscated, contains fragments related to 'update android samsung galaxy a8', reinforcing this phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/aws?utm_term=update+android+samsung+galaxy+a8 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4407989/normal_5fbb7157b4b2b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374207/normal_5f89a529ad85e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467950/normal_5fe18aca878d0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xeruxaxer/interquartile_range_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95b6b5dc-f22d-4769-84d1-2067f2e674c0/42797841454.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5286c635-2abd-401c-bcd8-2758cb7caa67/tensiometros_manuales_baratos.pdfIn PDF document text
    • https://s3.amazonaws.com/busutafitufe/b_d_auto_lock_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87205efe-57d8-401a-9369-9e2592c13ebc/295492788.pdfIn PDF document text
    • https://s3.amazonaws.com/legenapi/80800321712.pdfIn PDF document text
    • https://s3.amazonaws.com/wunojipu/76472057067.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a328a325-b847-4431-a8f0-36bc708ce7bf/duzapo.pdfIn PDF document text
    • https://s3.amazonaws.com/taturi/jisaguxejejan.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_off0000cdbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDBB 5632 bytes
SHA-256: 024f0168d8f2c7b4e7afc0a0894e304098b8179894c82961fe694f22063c4980
font_01_sfnt_off0000e0db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DB 10772 bytes
SHA-256: 6663155c862d675cfb155cedc8b4e45516fa49f087957bedb9a285516319fb2c