Malicious PDF — malware analysis report

Static analysis result for SHA-256 4900f27c97be75b0…

MALICIOUS

PDF

75.9 KB Created: 2021-03-01 00:40:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: cd809a1255aa4252401f5bff4d37b6c6 SHA-1: 8cfe3921b51bd8653519b151047cebd6a03ce304 SHA-256: 4900f27c97be75b0af5debf7b0318699acf50d37d31a65a4649dcb5bdb417789
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, designed to redirect users to various websites. The document body, though partially corrupted, suggests a lure related to a "craftsman router table combo manual". The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and a high ML classifier score strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the link farm structure is a common tactic for initial compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://lozipotod.ru/strik?utm_term=craftsman+router+table+combo+manual PDF link annotation
    • https://gadufekovofu.weebly.com/uploads/1/3/4/7/134764592/2468057.pdfIn PDF document text
    • https://cdn.sqhk.co/baxorurifina/dibRXii/masejuwugodamaditulofob.pdfIn PDF document text
    • https://cdn.sqhk.co/dosojegomugu/2jgiajj/40804066245.pdfIn PDF document text
    • http://wijeripe.iblogger.org/kuzogaputegubi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458122/normal_5ff3c0bc87579.pdfIn PDF document text
    • https://cdn.sqhk.co/sewujuzanas/zzhj8OL/girl_crush_meaning_in_telugu.pdfIn PDF document text
    • http://valezopifipob.22web.org/formation_of_blastula_in_humans.pdfIn PDF document text
    • http://tesidakikize.iblogger.org/calendario_2018_para_imprimir_gratis.pdfIn PDF document text
    • http://rutekotugu.22web.org/esl_worksheet_family_tree.pdfIn PDF document text
    • https://cdn.sqhk.co/fedovusig/Ojjvig9/95697986595.pdfIn PDF document text
    • http://nepizomojafedez.22web.org/manobogu.pdfIn PDF document text
    • https://cdn.sqhk.co/figesuweno/hdCShaw/i_love_hue_too_solutions_authority.pdfIn PDF document text
    • http://liwugukikijosi.iblogger.org/64630501435.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://besasasef.rf.gd/mariam_khan_reporting_live_bhakti_real_name.pdfIn PDF document text
    • http://besoxumewube.epizy.com/billing_information_request_form_template.pdfIn PDF document text
    • http://rexenejo.epizy.com/12322457210.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_off0000ee86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE86 5072 bytes
SHA-256: 29eef0d4a3b3a36e7a7a5d32d438a10fb1d589d3c7cde95373e63720a9799ce0
font_01_sfnt_off0000ffad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAD 10332 bytes
SHA-256: 40ecc2d0f74ceb485400f9afa1ecb17aedaed011915d6894b72b0847fb5e04f9

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