Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f8c96d30bd78f30…

MALICIOUS

PDF

67.1 KB Created: 2021-03-11 16:54:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1f13b87f300c1d311c2891b0af94fb14 SHA-1: 9deb4b835b915255750fbde05abbfda309002fd6 SHA-256: 1f8c96d30bd78f300742e865b67f0fd0d754419c4436ccf69f373e06ff0c6702
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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/strik?utm_term=what+does+rosemary%2527s+baby+look+like PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375344/normal_60104ae96ff3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499636/normal_5fd92c65d3cb9.pdfIn PDF document text
    • http://lupaper.22web.org/suzomadudejozezuraped.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405420/normal_5fca91591be73.pdfIn PDF document text
    • http://dapabikokewe.iblogger.org/25033528778.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490141/normal_601fc6686e03f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446489/normal_6012d2fb639da.pdfIn PDF document text
    • https://bepikasubezitix.weebly.com/uploads/1/3/4/3/134325559/770c9f92cf3.pdfIn PDF document text
    • https://ziwuwozapa.weebly.com/uploads/1/3/4/5/134517717/1636819.pdfIn PDF document text
    • https://betewobinolatid.weebly.com/uploads/1/3/4/7/134756009/4888893.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/pajeriramal/nietzsche_asi_hablo_zaratustra_alianza_editorial.pdfIn PDF document text
    • https://s3.amazonaws.com/nagev/materiales_compuestos.pdfIn PDF document text
    • http://pazizota.rf.gd/80203580468.pdfIn PDF document text
    • https://s3.amazonaws.com/dafumuxitupav/79314010353.pdfIn PDF document text
    • https://s3.amazonaws.com/vapite/vsco_free_filters_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/libosokune/science_process_skills_worksheets_printable.pdfIn PDF document text
    • https://s3.amazonaws.com/fefurorobumi/hootsuite_social_media_trends_report_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/wupagivoz/72191591909.pdfIn PDF document text
    • https://s3.amazonaws.com/vapelurowar/audiobook_player_app_android.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_off0000cad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD0 5416 bytes
SHA-256: 1a3511e675823e6df45e227a2e4484a554f0540eef86517ce0dc09730d1610bd
font_01_sfnt_off0000dd26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD26 9904 bytes
SHA-256: feb521e3259284232512596bacb2a73747dac6725f7d37f9d8f0cdd21218fd85

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