Malicious PDF — malware analysis report

Static analysis result for SHA-256 865912f34de305d5…

MALICIOUS

PDF

62.5 KB Created: 2020-11-24 07:58:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c807367197b73ccc2e5b844928a418ac SHA-1: 1241ca038293acb70e9bc1f13573b946fc8e6969 SHA-256: 865912f34de305d5b6366a25c84fd9dfefbff7135f3e3b75ecdf706398e548c0
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic further support this assessment. No scripts were extracted, but the overall structure and URL distribution point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://traffset.ru/strik?utm_term=2019+tamil+movies+video+songs
    • https://tuvomirunasoz.weebly.com/uploads/1/3/4/3/134324776/08dbbd67ab7d2c.pdf
    • https://voziguwotameba.weebly.com/uploads/1/3/4/3/134345279/visokumevu.pdf
    • https://rukazoxet.weebly.com/uploads/1/3/4/0/134040508/kuzovegozoz.pdf
    • https://dunefofitibo.weebly.com/uploads/1/3/4/6/134608320/dupiru.pdf
    • https://jevalibiku.weebly.com/uploads/1/3/4/2/134266190/vexutobi.pdf
    • https://vaxeratomox.weebly.com/uploads/1/3/4/3/134397216/9347218.pdf
    • https://janaravepok.weebly.com/uploads/1/3/4/8/134886337/48f8e23db5.pdf
    • https://vevurufutugar.weebly.com/uploads/1/3/4/7/134737477/kigorixawo.pdf
    • https://xunowarusaki.weebly.com/uploads/1/3/4/3/134371630/gonuja-sumukunixazubod-valule-wikusewina.pdf
    • https://rujemadatidugu.weebly.com/uploads/1/3/4/7/134747735/giperumol.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kevava/cambridge_igcse_ict_2nd_edition_answers.pdf
    • https://uploads.strikinglycdn.com/files/cb9d0ec3-67aa-43e5-ae2d-8c1a0379eb70/avengers_infinity_war_watch_online_1.pdf
    • https://uploads.strikinglycdn.com/files/840b02e2-50ef-4e4f-aab7-08596889a46c/72215955197.pdf
    • https://uploads.strikinglycdn.com/files/5955f435-0aaf-4d4d-953b-94ce22bcadc0/funk_guitar_book.pdf
    • https://s3.amazonaws.com/juvuraguvutoxif/letter_format_for_school_bus_service.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b87a.bin
448aa88fb5a7abfdc7f88d2759f6584d4cb0fd538885d612bdd5e307eb7f5855		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB87A 5496 bytes
font_01_sfnt_off0000cb23.bin
ce1cc109c5f13c4c0806af56b8347aaa62b7df6cb48fc56bd48a33e83eee303a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB23 9364 bytes

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