Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c27ac28a13b88aa…

MALICIOUS

PDF

73.0 KB Created: 2021-01-13 06:45:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: c3c6f475f802a20140bfaf28c7738535 SHA-1: 9b05f5326eb59cdf89405e96c8615ca0f6678e5f SHA-256: 9c27ac28a13b88aae146557751a41a5b6fc951cd38966cf4c6ce8c217d37c1f6
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which appear to be part of a link farm designed to drive traffic to specific keywords. The heuristic 'PDF_SEO_LINK_FARM' and the presence of numerous unknown URLs strongly suggest a phishing or scamming attempt. The ClamAV detection and ML classifier further confirm its malicious nature, likely related to phishing or malware distribution.

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 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://trafffe.ru/wb?keyword=app%20maker%20pro%20apk%20free%20download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420432/normal_5fa37a197f1d4.pdfIn PDF document text
    • https://site-1211564.mozfiles.com/files/1211564/marketing_management_basic_concepts.pdfIn PDF document text
    • https://nibivesulekot.weebly.com/uploads/1/3/4/0/134017222/vafijifirifomifafe.pdfIn PDF document text
    • https://cdn.sqhk.co/xumobopore/ehh5sge/11804484762.pdfIn PDF document text
    • https://dotanivim.weebly.com/uploads/1/3/4/7/134705276/jijixot-xokiga-pugipajo-tolasukeg.pdfIn PDF document text
    • https://cdn.sqhk.co/dabigewom/qjfLZha/pajosatizosufodamak.pdfIn PDF document text
    • https://nipogoloduvi.weebly.com/uploads/1/3/4/3/134368022/dakurisovezixe.pdfIn PDF document text
    • https://kofijowuz.weebly.com/uploads/1/3/4/4/134446653/bitiwazuge-foludufoxade.pdfIn PDF document text
    • https://tulivugid.weebly.com/uploads/1/3/4/6/134607321/watizakugiz-kafipivepi.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/xabalaru/nasowivevuxonira.pdfIn PDF document text
    • https://s3.amazonaws.com/padosumifubobo/rivife.pdfIn PDF document text
    • https://s3.amazonaws.com/jivamubug/air_brake_system_project_report.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabom/chopin_ballade_in_g_minor_op_23_no_1.pdfIn PDF document text
    • https://s3.amazonaws.com/dudurat/aoe_xanh_full_bn_chun.pdfIn PDF document text
    • https://s3.amazonaws.com/jijumupade/equifax_credit_report_number.pdfIn PDF document text
    • https://s3.amazonaws.com/ragejufa/1382410866.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_off0000e2e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E6 5152 bytes
SHA-256: cb1d7d78074b3085a302245b6c33c7d566262480e2e34c150edbd7ea144c3e03
font_01_sfnt_off0000f46f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46F 10396 bytes
SHA-256: 8b4c5988d18ed5f030d985e274dabcbb440e8cd7553d645a629fe93e056cf118

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