Malicious PDF — malware analysis report

Static analysis result for SHA-256 528cc7928a02af10…

MALICIOUS

PDF

72.5 KB Created: 2021-01-13 21:34:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 88a027890ed4a1160f2ec51af16e6815 SHA-1: edefbed4bf3b2ce2b9714fab2c0f4739335a6c18 SHA-256: 528cc7928a02af10b72e84e4b40c87523542911e66bc82571c9d4e6758d98c53
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 URI pointing to 'https://trafftec.ru/123?utm_term=irs+form+147c+request', which is likely the phishing destination. The document body, though heavily obfuscated, contains text fragments related to 'Irs form 147c request', reinforcing the phishing lure.

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://trafftec.ru/123?utm_term=irs+form+147c+request PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4492880/normal_5fb28a05be19c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495681/normal_5fe9fee06601e.pdfIn PDF document text
    • https://cdn.sqhk.co/baluwofuk/6P3jnqj/42314409516.pdfIn PDF document text
    • https://cdn.sqhk.co/tukawezezo/GDhiigE/alabama_road_trip_route_66.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475564/normal_5ff7a1f40ceb0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420764/normal_5fd22a85208c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389085/normal_5fa89f2c91c4d.pdfIn PDF document text
    • https://cdn.sqhk.co/fijajiles/b44ggF4/high_school_simulator_2017_online_game.pdfIn PDF document text
    • https://site-1166708.mozfiles.com/files/1166708/mix_video_player_app.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/rebomedug/neruppe_sikki_mukki_song_lyrics.pdfIn PDF document text
    • https://s3.amazonaws.com/pukiza/17036078339.pdfIn PDF document text
    • https://s3.amazonaws.com/bidurudilidujug/emmerich_manual_training_high_school.pdfIn PDF document text
    • https://s3.amazonaws.com/wibadinavosunom/sky_movies_family_hd_tv_guide.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_off0000e10f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE10F 5068 bytes
SHA-256: a1ed3d1a690c5b14ac630940c9a5b3f3bc5203c65db4ef94ef5a41ea7199b260
font_01_sfnt_off0000f253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF253 10264 bytes
SHA-256: 02492b4e045809a98bea72b9d186d62b996407221188d91d1116f92ea0229375