Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ef81e83ece41e70…

MALICIOUS

PDF

91.6 KB Created: 2021-03-01 13:09:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 92bf37b2188f983ca8e113bb9925460e SHA-1: 48c59e4fe99b8fef92f84a0d86b460b1903a26e8 SHA-256: 4ef81e83ece41e70946277b1611b34b5c70997ff9115c78ac94d134a8d9fcbed
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL that points to a suspicious domain, likely intended to deliver a malicious payload or phish for credentials. The document body, though heavily obfuscated, suggests a lure related to a 'publisher' or 'winning' content.

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://ponafet.ru/123?utm_term=winning+jack+welch+publisher PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4468823/normal_5fda21cdd2744.pdfIn PDF document text
    • https://cdn.sqhk.co/limizolaxa/chimbhd/wasufupipujofugujupi.pdfIn PDF document text
    • https://cdn.sqhk.co/wedegetuso/I2ghjbD/vuwufomilarafirejoz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366384/normal_601121b63e22f.pdfIn PDF document text
    • https://cdn.sqhk.co/datawafag/hdgfLig/lefenunakujurazugimemo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410441/normal_601fb0740c045.pdfIn PDF document text
    • https://cdn.sqhk.co/wadelovelo/gyBArwp/zunexabovivuvi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465127/normal_602ea6fdb9055.pdfIn PDF document text
    • https://cdn.sqhk.co/zebenane/Z4jcGrT/animatronics_mod_minecraft.pdfIn PDF document text
    • https://cdn.sqhk.co/nazopekujavi/Yhcjhhj/hockey_jersey_outfit.pdfIn PDF document text
    • http://igbusinessabouthelp.com/79842118032g6drt.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvurero/ahbjhVg/24261372901.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
    • http://veluvuwipigunuw.rf.gd/yearly_calendar_2018_excel_template.pdfIn PDF document text
    • https://s3.amazonaws.com/lukepepe/45407687938.pdfIn PDF document text
    • https://s3.amazonaws.com/tabobujimo/comfort_zone_infrared_heater_cz2011c_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/dibedamoka/vertical_axis_wind_turbine_ppt.pdfIn PDF document text
    • https://s3.amazonaws.com/fipijife/jixevapoziredufef.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_off00011a26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A26 5272 bytes
SHA-256: 8577c4e3ca34035960484294ced97438a6c227c685bdb7c5d1297df6f2c7c41d
font_01_sfnt_off00012c13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C13 11276 bytes
SHA-256: 2b7b4d4d13d908542deeacfffd36fbd1b90a8fe555017306bbdf164ea92f650c
font_02_sfnt_off000152be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152BE 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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