Malicious PDF — malware analysis report

Static analysis result for SHA-256 156e3b570530cb32…

MALICIOUS

PDF

70.5 KB Created: 2021-02-20 23:21:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: d48d2ad28c21a83edfef9345aa854e33 SHA-1: 7635c216c00d742a1a9a4cfe5c47e3c66df8424a SHA-256: 156e3b570530cb32081824a70a552704e782fc5f1253680a7b479fcae479e1d1
126 Risk Score

Malware Insights

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

The PDF file contains an embedded URI that redirects to a suspicious domain, identified by heuristics as a link farm and flagged by ML classifiers and ClamAV as malicious phishing content. The document body, though heavily obfuscated, appears to be a lure related to car repair information, aiming to trick users into clicking the malicious link. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/strik?utm_term=how+much+is+a+transmission+for+a+2007+impala PDF link annotation
    • http://e-sparks.ru/best_openings_for_chess_beginnersxz78r.pdfIn PDF document text
    • http://zawuruliwisevo.iblogger.org/51341504815.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378175/normal_5fccff3e95d12.pdfIn PDF document text
    • https://cdn.sqhk.co/zebimapajod/gijfbhh/how_to_mix_paint_to_make_brown.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481539/normal_602205a06338c.pdfIn PDF document text
    • https://cdn.sqhk.co/temejikowewa/O6ijhgM/my_boy_gba_emulator_iphone.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393345/normal_5fe44d20aa616.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388037/normal_601aa810a0bc2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497685/normal_5fc7e128da4f9.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/savukojubusum/71678633998.pdfIn PDF document text
    • https://s3.amazonaws.com/fokapikow/32812795914.pdfIn PDF document text
    • http://buwumipulufi.epizy.com/alopecia_cicatricial_en_nios.pdfIn PDF document text
    • http://megavidovafivo.epizy.com/how_to_reset_hp_ink_cartridge.pdfIn PDF document text
    • http://ravesezubepad.epizy.com/nebibutofab.pdfIn PDF document text
    • https://s3.amazonaws.com/xakapudakadu/86299957005.pdfIn PDF document text
    • https://s3.amazonaws.com/tasufagijaremo/xakenazirerijabaxozisagi.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_off0000d5ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5EF 5660 bytes
SHA-256: 81448f7b5c881825807c51fe9504177c745a536b22edb5d2e6476d04dec5062f
font_01_sfnt_off0000e91f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91F 10576 bytes
SHA-256: 25efb07f971f2b36d293fa352a6bf1a46a5c5e4e3add8b6fafc0920044e38917

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