Malicious PDF — malware analysis report

Static analysis result for SHA-256 49435c172251d489…

MALICIOUS

PDF

71.9 KB Created: 2021-03-28 02:40:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: fddefac0ecab6aa6d7328b5f15598c6b SHA-1: 17b9ec71458fe6d851dd91cb2b829356e48708e0 SHA-256: 49435c172251d489ebe6a8a0e0d4657201b35d66c3181bc4fbfc4fdfbbac49b3
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://midufefew.ru/123?utm_term=best+jeopardy+powerpoint+template+with+sound PDF link annotation
    • https://wujabadatudipox.weebly.com/uploads/1/3/5/4/135400083/xidutusebexol_poxawo_wamiz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484383/normal_605957353c793.pdfIn PDF document text
    • http://igcopyrightforhelps.com/251020455569kpm8.pdfIn PDF document text
    • https://tonituligavu.weebly.com/uploads/1/3/4/8/134884188/8156186.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494883/normal_604d43fa259a4.pdfIn PDF document text
    • http://widaget.22web.org/tuzazefadebej.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368487/normal_5ff8930463b92.pdfIn PDF document text
    • https://pepadamive.weebly.com/uploads/1/3/4/4/134468065/8908987.pdfIn PDF document text
    • http://loluxeloju.iblogger.org/canon_canoscan_lide_110_manual.pdfIn PDF document text
    • http://copyrightsupport-ig.com/what_are_the_strengths_of_transformational_leaderships8gmx.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/tevigotu/nirobowutagukox.pdfIn PDF document text
    • https://s3.amazonaws.com/julaxel/fawux.pdfIn PDF document text
    • https://s3.amazonaws.com/gopuze/51323489093.pdfIn PDF document text
    • http://visobiwedixupip.rf.gd/cadwaladr_quests.pdfIn PDF document text
    • https://s3.amazonaws.com/najubu/58208980031.pdfIn PDF document text
    • http://bupokapif.rf.gd/hp_officejet_5740_ink_cartridge_problem.pdfIn PDF document text
    • http://poduzamilikuki.rf.gd/alcalosis_metabolica_y_respiratoria.pdfIn PDF document text
    • https://s3.amazonaws.com/netinuwa/business_plan_template_retail_shop.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_off0000dcb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB2 5516 bytes
SHA-256: 35dc1bbdb19f1335ebb74883bb6d121b833dd118c1ee8e43628e2fa70bebdabc
font_01_sfnt_off0000ef5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5F 10296 bytes
SHA-256: ff066fc8018137277337b5c32b1a379c38130bfd051182361d9151ccebfc6f56

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