Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad33dbdd52ef427a…

MALICIOUS

PDF

83.2 KB Created: 2021-03-31 10:55:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 3f114896edc879fbd1237be75df929aa SHA-1: e9ffc86c5cdba626c53214f3473712f6cc091429 SHA-256: ad33dbdd52ef427a87411cd49f16a6c213e3773f97662d84b0c40ddb277514d7
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a PDF SEO link farm. The primary external URI points to a suspicious domain, suggesting a redirection or phishing attempt. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate malicious intent to drive traffic to external, potentially harmful, websites.

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 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.
  • 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://botokaw.ru/award?keyword=answering+islam+pdf+download PDF link annotation
    • https://fapufeloku.weebly.com/uploads/1/3/1/0/131071019/d26e2ba70edf7b6.pdfIn PDF document text
    • https://kolokizegilo.weebly.com/uploads/1/3/4/3/134370221/7d23efdb08b948.pdfIn PDF document text
    • https://wuwesojelure.weebly.com/uploads/1/3/5/9/135973580/dilalisusaw.pdfIn PDF document text
    • http://vibigalobonewil.iblogger.org/mowenirugepup.pdfIn PDF document text
    • https://powelogub.weebly.com/uploads/1/3/1/8/131871449/lutaruwoz-nivavexujuruf-zanefat-kadexiwilojoroz.pdfIn PDF document text
    • https://kajuzenutojaso.weebly.com/uploads/1/3/4/6/134631714/5797985.pdfIn PDF document text
    • https://tudexabi.weebly.com/uploads/1/3/4/7/134770635/vuvidefuvoso.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/jevelel/bilaxawiwuwopuwetuxawuxom.pdfIn PDF document text
    • https://s3.amazonaws.com/lijopavexanuse/android_manager_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/xeruxaxer/frases_do_livro_esposa_que_ora.pdfIn PDF document text
    • https://d99c26cc-8c68-456d-a039-1a26994c8d26.filesusr.com/ugd/105a8c_cfa63bc8e2be441db58241eb51f61c74.pdf?index=trueIn PDF document text
    • http://rixupod.rf.gd/letter_s_jolly_phonics_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/setaxilitozuko/how_much_are_blood_pressure_monitors_at_walgreens.pdfIn PDF document text
    • http://bajewilogofiro.epizy.com/clinical_guidelines_for_liver_transplantation.pdfIn PDF document text
    • https://s3.amazonaws.com/fivebo/pubedawab.pdfIn PDF document text
    • https://s3.amazonaws.com/bokofapig/gatoguwezudupikose.pdfIn PDF document text
    • https://s3.amazonaws.com/bulozor/durofijof.pdfIn PDF document text
    • https://s3.amazonaws.com/mekonulegipero/ias_exam_questions_and_answers_in_malayalam.pdfIn PDF document text
    • https://cf21b241-1edd-4e7a-8b85-4b7fa12bec5a.filesusr.com/ugd/835652_be0e5595669942368bd86b04778c0434.pdf?index=trueIn 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_off0001078c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078C 5444 bytes
SHA-256: cb976a812e27e449abca9bcdf29cfdf86b95731161134935ccc702875d672564
font_01_sfnt_off00011a0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A0B 11040 bytes
SHA-256: 916927b7f3f5aba2266746070dda088cfa8603d8d4a598a2bf52246b0d1cb38e

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