Malicious PDF — malware analysis report

Static analysis result for SHA-256 033fce6a921e6257…

MALICIOUS

PDF

73.4 KB Created: 2021-02-17 02:48:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: c9eca5cf68f67e955ec55f027c4af5cc SHA-1: 426840eff2b78fee8a127340b9486030ea86bfeb SHA-256: 033fce6a921e6257613bfe239af56fd30ba3d482eeaca44d92043af04f2cba4a
214 Risk Score

Malware Insights

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

The PDF contains numerous links, with one critical heuristic identifying it as a link farm pointing to malicious redirector infrastructure. The document body, though partially corrupted, suggests a lure related to an English course. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent, likely for phishing or malware delivery.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://crophysi.ru/strik?utm_term=curso+b%25C3%25A1sico+de+ingl%25C3%25A9s+para+principiantes+desde+cero+clase+3 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4446496/normal_601b6cad25e8b.pdfIn PDF document text
    • https://sasadopebob.weebly.com/uploads/1/3/5/3/135324308/xaduxavozubavenu.pdfIn PDF document text
    • http://lnstagram-helping-centre.com/yahtzee_score_cards_printrlsng.pdfIn PDF document text
    • http://discovljzg.fun/337043754430j72e.pdfIn PDF document text
    • http://asta-stroy.ru/wokafedivadifegadazinnq2l.pdfIn PDF document text
    • https://gatilesajegume.weebly.com/uploads/1/3/1/0/131070678/kamag.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443342/normal_5fcbd6181f100.pdfIn PDF document text
    • http://itali-big.space/piledadimemosq65xi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414161/normal_5fd93c428c06b.pdfIn PDF document text
    • http://lovelyhouse.online/ruwunisepivoxa7t20b.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/donarepemi/6149413242.pdfIn PDF document text
    • https://s3.amazonaws.com/sizadagazagaj/dedinurinudizosisik.pdfIn PDF document text
    • https://s3.amazonaws.com/xuxifuzituwu/gypsy_jazz_accordion_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/xenavuxa/tratamiento_fisioterapeutico_para_hernia_discal_cervical.pdfIn PDF document text
    • http://fupuvafibip.rf.gd/96024435218.pdfIn PDF document text
    • https://s3.amazonaws.com/perurulexi/aarakshan_movie_300mb.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_off0000ddbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBC 5824 bytes
SHA-256: f9d87e619e8de117e42788dbb6b7600bf5bd39db4720679e5dc9943cd0a7f70c
font_01_sfnt_off0000f0b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B5 11228 bytes
SHA-256: 8ffe037a1a03bd7914d6cd5b2ed06403e44ad15933b14e7518f08f756d08c305

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