Malicious PDF — malware analysis report

Static analysis result for SHA-256 183d4ef4abd1f40a…

MALICIOUS

PDF

78.0 KB Created: 2021-03-30 17:28:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 464f3773460a316af506eeb8a524d788 SHA-1: 8877ca6a91d2dd4da910438313a186ae391966f5 SHA-256: 183d4ef4abd1f40acfb568c5007cd44ba51d0ab07733ab0fea5b31748bc03f50
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to exploit users through deceptive content and numerous external URLs.

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://mezovuduw.ru/award?keyword=automation+testing+interview+questions+and+answers+pdf+free+download PDF link annotation
    • http://tihefers.online/libro_para_aprender_a_dibujar_mangaqkrzh.pdfIn PDF document text
    • http://tareworig.mywebcommunity.org/16253673987.pdfIn PDF document text
    • http://uaregroup.com/51827853498n3dvl.pdfIn PDF document text
    • http://jerunuju.mypressonline.com/renagizebejunam.pdfIn PDF document text
    • https://cdn.sqhk.co/runudori/goF1ifW/parkour_the_office_animals.pdfIn PDF document text
    • https://tonogedufeji.weebly.com/uploads/1/3/4/3/134378200/foxivode.pdfIn PDF document text
    • https://cdn.sqhk.co/tobijoge/jcGjfMj/74950433522.pdfIn PDF document text
    • http://sinoxaju.mygamesonline.org/niwitetuwax.pdfIn PDF document text
    • https://wozukepob.weebly.com/uploads/1/3/4/0/134017809/6655103.pdfIn PDF document text
    • https://cdn.sqhk.co/vifejoneses/hAijSjh/jirunixenu.pdfIn PDF document text
    • http://pezejij.mygamesonline.org/23861640688.pdfIn PDF document text
    • http://lagujegivupani.22web.org/28419602620.pdfIn PDF document text
    • http://zoxodur.sportsontheweb.net/jigaku.pdfIn PDF document text
    • https://cdn.sqhk.co/tavanaru/iC2rpin/83547446360.pdfIn PDF document text
    • https://jojapewabivato.weebly.com/uploads/1/3/1/3/131379205/birujovavajusip.pdfIn PDF document text
    • https://cdn.sqhk.co/seworani/dia1ghB/naxipepuduturamudabafipe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fowidosufos.epizy.com/principles_of_geotechnical_engineering_9th_edition_ebook.pdfIn PDF document text
    • http://vizulubafaxal.epizy.com/erosion_and_deposition_by_glaciers_answer_key.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_off0000f46a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46A 5628 bytes
SHA-256: 03a17f0410a68a78dac2c7615ffb622b5dce80e1012b46c2f5b0990abd64cdb2
font_01_sfnt_off0001077f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1077F 10748 bytes
SHA-256: e51ce68dc9b0557692d20cfa807cd2a426aa7d114eaca20280a4cccf1139317a

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