Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4bac454394012f9…

MALICIOUS

PDF

90.8 KB Created: 2021-03-31 03:14:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 7e7a5508850244d0d3905055f40efd49 SHA-1: f66fd7b08ee7a53b83ce0df16b9cb795097c58e5 SHA-256: f4bac454394012f9098a42ca8d7bd5bf754e155924ebeae90b12fe48effbe228
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a primary suspicious URL pointing to a site that appears to be a link farm or SEO spam page. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to 'kartilya ng katipunan ni emilio jacinto pdf', which is likely a deceptive tactic to drive traffic to the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/award?keyword=kartilya+ng+katipunan+ni+emilio+jacinto+pdf PDF link annotation
    • https://xovixonu.weebly.com/uploads/1/3/4/8/134896571/vakijoxijopezefar.pdfIn PDF document text
    • https://cdn.sqhk.co/xovatagemi/hhdjct4/vidofimitatanevuxevobifu.pdfIn PDF document text
    • https://nabatiniwoz.weebly.com/uploads/1/3/4/8/134889778/mejujakiw.pdfIn PDF document text
    • https://tasitonedilegu.weebly.com/uploads/1/3/5/3/135301248/wometedexib_wexuxekav_zutuxoxurupid.pdfIn PDF document text
    • https://meliwuka.weebly.com/uploads/1/3/2/7/132740471/541544.pdfIn PDF document text
    • http://biomaniix.website/bupexekuzejs10yv.pdfIn PDF document text
    • https://vekewofamir.weebly.com/uploads/1/3/4/1/134131384/c34ee2aff24002.pdfIn PDF document text
    • http://smartcreditcheck.info/ford_mustang_gt_premium_2019b6dwj.pdfIn PDF document text
    • https://zosagobe.weebly.com/uploads/1/3/1/3/131380163/zerujagazowupukani.pdfIn PDF document text
    • https://cdn.sqhk.co/zirizowesaw/didQfjj/avast_antivirus_for_pc_offline.pdfIn PDF document text
    • https://cdn.sqhk.co/ruperodu/sXidPP3/ngp._emu_1._5._42_apk.pdfIn PDF document text
    • http://confirmationhelpcenter.com/almond_cultivation_in_india157py.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/babuxufarizuxur/illegal_dumping_report.pdfIn PDF document text
    • https://s3.amazonaws.com/nefunupu/xolatatijep.pdfIn PDF document text
    • https://s3.amazonaws.com/nigimul/35973900870.pdfIn PDF document text
    • https://s3.amazonaws.com/punagilelabon/netepidepezuzi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC91 16748 bytes
SHA-256: 5307c934fb9887cb41e178fcdba47140dd5deeb30518126e5bef49a779ed7fe9
font_01_sfnt_off00012342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12342 5508 bytes
SHA-256: 2de4ac6a840bf4bca4ed95b8536bf86a2534553558fd408112f12022b695073a
font_02_sfnt_off00013601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13601 11824 bytes
SHA-256: b7dbddb0fc9c59b4fcc96898cf6fda1873880fb8e6b1acbf00a212cb3f89f603

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