Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6a3428881194dd0…

MALICIOUS

PDF

74.0 KB Created: 2021-02-19 19:59:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 060c5d9e8dcc5cbc8d544556c495d6ba SHA-1: 7ea7e61fbf98cd341e192faeae70a7c4dc453bc9 SHA-256: c6a3428881194dd02b55e746907f242a0515a692a3d5a12dceca025fa5515274
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, suggests a lure related to trading penny stocks. The presence of multiple disposable hosting links and UTM parameters indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/strik?utm_term=how+to+trade+penny+stocks+in+canada PDF link annotation
    • http://pe50off.pro/bansidhar_ka_song83unu.pdfIn PDF document text
    • http://wofupovuneraja.iblogger.org/princeton_review_10_practice_test_answer_key.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490757/normal_5ff0860ad5f0f.pdfIn PDF document text
    • http://pubgmobiie.com/angularjs_directive_attribute_without_templatexoe6h.pdfIn PDF document text
    • http://fitit.space/70225992233vqwbl.pdfIn PDF document text
    • http://tikovg.xyz/gejiwubovogi7j3cl.pdfIn PDF document text
    • http://lunesygets.xyz/alesis_multimix_8_usb_fxtupnj.pdfIn PDF document text
    • https://bewulikafujisew.weebly.com/uploads/1/3/5/3/135326730/6199925.pdfIn PDF document text
    • https://cdn.sqhk.co/bulixanejad/ogcHrym/free_photo_special_effects_programs.pdfIn PDF document text
    • https://tojumofudino.weebly.com/uploads/1/3/2/6/132681199/nexizemoxuvirufuniwa.pdfIn PDF document text
    • https://cdn.sqhk.co/xaranoraf/jaGRepZ/nobitatomipuvirugefivapu.pdfIn PDF document text
    • https://ranetaxute.weebly.com/uploads/1/3/4/8/134886021/8841444.pdfIn PDF document text
    • https://cdn.sqhk.co/depadukat/hhja3OS/srs_xb12_sony.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377912/normal_6016e16d37a56.pdfIn PDF document text
    • https://cdn.sqhk.co/bexamajuw/Zx5gdnh/74391924371.pdfIn PDF document text
    • https://tefajakitom.weebly.com/uploads/1/3/1/3/131378990/177938.pdfIn PDF document text
    • http://zijimesaxa.iblogger.org/83197253845.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445119/normal_602999d3340e4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://borarujedumamut.epizy.com/81329141642.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_off0000e444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE444 5252 bytes
SHA-256: 84124d436c9e194d7de430472bcf8b54ebbd3acf3e621c2fcc8839fcd4c1e06c
font_01_sfnt_off0000f648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF648 10600 bytes
SHA-256: 5c6b83a14e900b651b9cbc93c216b8a9bb4497e86a001e786f4739747358fff3

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