Malicious PDF — malware analysis report

Static analysis result for SHA-256 99e7afaaa894707f…

MALICIOUS

PDF

88.4 KB Created: 2020-12-23 09:53:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 023c1deeaa8efbfc4a6e51f5cd2c24b4 SHA-1: 1bafe740b753b0e90dfc69e32cd08ea19f3fbc19 SHA-256: 99e7afaaa894707ffc351e40f4a9f8b4196702a39c6eb9a50f80ba5a2c176f16
96 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded URL pointing to 'trafftec.ru', which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, suggests a technical manual or similar lure, consistent with phishing attempts.

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://trafftec.ru/123?utm_term=elk+dft+manual
    • https://cdn-cms.f-static.net/uploads/4418362/normal_5fa97ee55b9de.pdf
    • https://static.s123-cdn-static.com/uploads/4496381/normal_5fe01e772a4e0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wunupalezozerud/area_code_916.pdf
    • https://s3.amazonaws.com/xisefowu/wenez.pdf
    • https://static1.squarespace.com/static/5fdc7d509de11a3bcb749b5f/t/5fdcb5f007858c174a49df81/1608300017047/identifying_rational_and_irrational_numbers.pdf
    • https://s3.amazonaws.com/rekorewexidiwo/vibax.pdf
    • https://s3.amazonaws.com/poguvelefa/freertos_api_guide.pdf
    • https://uploads.strikinglycdn.com/files/fb8305e2-8758-4550-91ea-3977634076e3/40463051882.pdf
    • https://s3.amazonaws.com/wexukufedepim/42019369405.pdf
    • https://uploads.strikinglycdn.com/files/03a209c1-79a5-4f08-9164-921696fdfba9/la_catedral_cesar_mallorqui_ejercici.pdf
    • https://static1.squarespace.com/static/5fc0f33f2cf09257bd6c4f7e/t/5fc5c9259d79364840560766/1606797605815/ramadan_quiz_questions_and_answers_in_malayalam.pdf
    • https://s3.amazonaws.com/vibasujefir/mathworksheets4kids_multiplication_drills.pdf
    • https://s3.amazonaws.com/fovezewi/current_affairs_2019_questions_and_answers_pakistan.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00012550.bin
fc715378412e25dca97a91186418464c669a53ee3f13ce095f39ce7d80b791d4
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12550 27160 bytes
font_00_sfnt_off0000eeec.bin
d98aca258a40db088b74605bbfe276fc10e338ae207524834e10241bc279046d
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEC 4800 bytes
font_01_sfnt_off0000ff34.bin
141f79b7c48e5804e642a38a0f382cc5ecb5b03d1a330fa58235efe36323c02c
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF34 11300 bytes