Malicious PDF — malware analysis report

Static analysis result for SHA-256 1df1e7c7e598c528…

MALICIOUS

PDF

68.1 KB Created: 2021-03-14 11:16:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 9b3dc6ba77df38678f446439900340ee SHA-1: ec5fdc3c1384e90cfadc328118da4dd0fec21e15 SHA-256: 1df1e7c7e598c5280261b2ac0c3f20e8148ccfbd19d3dfbc31d34466b733e243
126 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 numerous external URLs, many hosted on disposable domains, suggesting a link farm or redirection mechanism. The document body, though heavily obfuscated, contains text related to business card templates, indicating a lure to entice users to click on the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://resalured.ru/strik?utm_term=plantillas+para+hacer+carnet+empresarial PDF link annotation
    • http://zakilifawurafed.22web.org/47128862216.pdfIn PDF document text
    • https://xopilujipuwoka.weebly.com/uploads/1/3/4/8/134886601/1448623.pdfIn PDF document text
    • http://sexesex.site/bedofevilibotoxafelebaruvhwq8.pdfIn PDF document text
    • http://bubuwem.iblogger.org/87379950835.pdfIn PDF document text
    • https://xesudubivutomu.weebly.com/uploads/1/3/5/3/135303490/gokiv.pdfIn PDF document text
    • https://pivozedotafi.weebly.com/uploads/1/3/1/0/131070355/1920586.pdfIn PDF document text
    • https://gevexivojuler.weebly.com/uploads/1/3/4/4/134444242/65504528.pdfIn PDF document text
    • http://firstdoctor.xyz/825112305643vbsu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tivurazug.rf.gd/hp_officejet_7612_printhead_cost.pdfIn PDF document text
    • https://s3.amazonaws.com/xakapudakadu/93756994418.pdfIn PDF document text
    • http://zosajirigo.rf.gd/rutezisunexolobe.pdfIn PDF document text
    • http://jejivosijej.rf.gd/sopide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9683835e-2a70-41e9-b299-b8889e154308/razapatuwodujoda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7d467d6-4936-4352-aa0a-b4c5fc654cff/presto_dehydrator_trays_06300.pdfIn PDF document text
    • http://xatosizukav.epizy.com/40169217221.pdfIn PDF document text
    • https://s3.amazonaws.com/paxunu/71113769135.pdfIn PDF document text
    • http://luzawuwu.epizy.com/botaxaninorijo.pdfIn PDF document text
    • http://zurinelu.epizy.com/performance_appraisal_role_play_exercise.pdfIn PDF document text
    • https://s3.amazonaws.com/kibavutibeved/ponipegorupol.pdfIn PDF document text
    • https://s3.amazonaws.com/jodabiladezot/dolore_alla_schiena_e_formicolio_alle_gambe.pdfIn PDF document text
    • http://mapiwenasadig.rf.gd/mawosozifijitozipoxana.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_off0000cb87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB87 5176 bytes
SHA-256: a6c0a59bc8f9ff1c789c1a8da5a4e218053c1e0f761c702d04026fbff56e3937
font_01_sfnt_off0000dcf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF7 11248 bytes
SHA-256: fcf45b19cd7d8ccdfc80f99fb065503f87ce0494aae72e1f3c91dea0f230caed

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