Malicious PDF — malware analysis report

Static analysis result for SHA-256 37c11cf350d81d01…

MALICIOUS

PDF

79.6 KB Created: 2021-03-10 14:44:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 4361aa69b89ecb9a76cf67c6e8d826a3 SHA-1: de0b9f407c8edcecbccb7bd0e93c1026a61d9440 SHA-256: 37c11cf350d81d01c2c076fdc849e79eee30bd1624f8feeeb9575c90e43bc7af
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains or using UTM parameters, indicative of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are common in phishing lures and SEO manipulation schemes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • 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://jottigo.ru/strik?utm_term=california+form+568+instructions+2015 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4475564/normal_5fefd210c6d44.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418762/normal_601391a00b95a.pdfIn PDF document text
    • https://cdn.sqhk.co/mobubivifa/7YjeLgh/34811163326.pdfIn PDF document text
    • https://cdn.sqhk.co/pifizumux/qihanja/sewezafodadegijuposebulu.pdfIn PDF document text
    • https://tewazaxapij.weebly.com/uploads/1/3/4/8/134873756/5614826.pdfIn PDF document text
    • https://cdn.sqhk.co/mokavokaven/5dmhfhd/fruit_fancy_game_apk_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501364/normal_600abcc418451.pdfIn PDF document text
    • https://fowaloxew.weebly.com/uploads/1/3/4/8/134881160/8513156.pdfIn PDF document text
    • https://cdn.sqhk.co/soziwariru/hatheij/clash_of_queens_light_or_darkness_hack.pdfIn PDF document text
    • https://cdn.sqhk.co/bomemenun/qhhdvKL/35704362959.pdfIn PDF document text
    • https://fezemopozopedet.weebly.com/uploads/1/3/5/3/135326879/cc1050a92.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490250/normal_5fe2a7254539a.pdfIn PDF document text
    • http://vinuporabomod.iblogger.org/63247165257.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473903/normal_603201737d97c.pdfIn PDF document text
    • https://dexejajakoto.weebly.com/uploads/1/3/0/7/130739268/ginozodovubopiseb.pdfIn PDF document text
    • https://cdn.sqhk.co/jalafimimodo/ujajdzF/47985851010.pdfIn PDF document text
    • https://xoxajunun.weebly.com/uploads/1/3/4/3/134351876/3817005.pdfIn PDF document text
    • https://cdn.sqhk.co/fujonexa/ihheifQ/twin_bunk_beds_with_storage_underneath.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/fopalew/88482550514.pdfIn PDF document text
    • https://s3.amazonaws.com/towakog/dareriwubunelopotajozine.pdfIn PDF document text
    • http://nozoxofepek.rf.gd/12998801032.pdfIn PDF document text
    • http://tojuributesef.epizy.com/illustrated_cabinetmaking_bill_hylton.pdfIn PDF document text
    • http://sipawas.epizy.com/kojumavidibo.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_off0000f480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF480 5732 bytes
SHA-256: dcfc478beb2994024432b35951b109905fe83baf224ca9bf86ac034f4fd1ae8b
font_01_sfnt_off000107f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F3 12184 bytes
SHA-256: c6e119ecc3996ac1e58c5c2b47336e0d8a6aa94b3ef3ca5273d1b168a3080dfc

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