Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8dd31d94e889e79…

MALICIOUS

PDF

76.0 KB Created: 2021-03-20 23:59:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2a49ba427e04ef42816835ff356c2e10 SHA-1: b252b7169a53c7b8a13a0170edb9087d56ad6b64 SHA-256: c8dd31d94e889e798fb42cc5af239b0ec9ecae0ab2d31cf918a38513ff866c2d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9997

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://pelibifir.ru/award?keyword=palavras+cruzadas+coquetel+em+pdf+para+imprimir PDF link annotation
    • http://jajitefufig.iblogger.org/does_shiro_die.pdfIn PDF document text
    • https://cdn.sqhk.co/zifiguwosu/bigvDK6/83208928594.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408475/normal_5febb376db5c2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382643/normal_5fcae865547d7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414688/normal_60081b0dd3c05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460460/normal_603183272b940.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408321/normal_5febc4faae7eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425492/normal_5fd3772ec9acf.pdfIn PDF document text
    • https://cdn.sqhk.co/vakenuda/eaCHBia/fall_race_3d_online.pdfIn PDF document text
    • https://cdn.sqhk.co/zisubiziwu/idGihha/weekly_sales_deals_coupons_extension.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389387/normal_6053bfdf86d1b.pdfIn PDF document text
    • https://cdn.sqhk.co/sobexofap/1hejiii/76491752135.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://teworubinogo.epizy.com/bestway_cement_annual_report_2013-_14.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71e630ea-3395-4311-a3ba-955ce3284dc1/angles_parallel_lines_worksheet_answers.pdfIn PDF document text
    • http://wavudipikudela.epizy.com/monig.pdfIn PDF document text
    • https://s3.amazonaws.com/gixawetopoli/jijokuxefilupipo.pdfIn PDF document text
    • http://zisepuz.rf.gd/bigubodinivitorabodo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2b3691a-ce40-40cf-a7e6-ad4d85a73c6a/74659192268.pdfIn PDF document text
    • http://zavedofidime.rf.gd/49436598036.pdfIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/bowers_wilkins_formation_duo_speakers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77e0f851-537b-43af-87d8-901fd9184a0d/how_long_do_septic_leach_fields_last.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_off0000e542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE542 5540 bytes
SHA-256: a52a253902d12d1483e8b653f4c13700f019bfd890213b2ecaf58afb72640e99
font_01_sfnt_off0000f812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF812 13460 bytes
SHA-256: 33d4e7da9ef3a00d3b271d2c4f4e8b26e1c9bf21e7a93d3b26926d1b71c1845e

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