Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b39d31629d77c24…

MALICIOUS

PDF

101.0 KB Created: 2021-03-24 08:32:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 7e08e630642afb3f61a49f02ae29de79 SHA-1: 8138e4ce22d08dff8c3f787ffc94aed3e3ea595c SHA-256: 1b39d31629d77c24522175620f76121ac8ac04d25c1bd3839d8ae04635913248
126 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs pointing to various PDF files hosted on disposable domains and link farms, suggesting a tactic to distribute malicious content or phish for information. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a link farm designed for SEO manipulation to attract unsuspecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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://resalured.ru/award?keyword=catecholaminergic+polymorphic+ventricular+tachycardia+pdf PDF link annotation
    • http://d2-club.ru/guia_para_aprender_a_tocar_guitarrazjnow.pdfIn PDF document text
    • https://cdn.sqhk.co/dojoxuwote/qgjhcUK/nccn_guidelines_lung_cancer.pdfIn PDF document text
    • http://alternativeinfluencenetwork.net/49096234401z2bv1.pdfIn PDF document text
    • https://cdn.sqhk.co/matijamaj/agdAh2X/24488668816.pdfIn PDF document text
    • http://vas-rem.ru/traffic_racer_windows_7_indirfvn3z.pdfIn PDF document text
    • https://cdn.sqhk.co/bopelara/ahjghhj/22493728358.pdfIn PDF document text
    • https://diziwupufetut.weebly.com/uploads/1/3/4/4/134477772/81ad6463fdfe69a.pdfIn PDF document text
    • https://bisatabezuniv.weebly.com/uploads/1/3/1/3/131398333/8391721.pdfIn PDF document text
    • https://cdn.sqhk.co/fakodozug/mjegcxv/train_controller_jobs_canada.pdfIn PDF document text
    • https://betebawaxudu.weebly.com/uploads/1/3/5/3/135388356/7060719.pdfIn PDF document text
    • https://vifatogiso.weebly.com/uploads/1/3/4/3/134316440/7456974.pdfIn PDF document text
    • http://english-10.site/349039572238hwid.pdfIn PDF document text
    • https://cdn.sqhk.co/bujasugawo/Ghfbif3/38955626698.pdfIn PDF document text
    • http://teachersaid.fun/how_much_does_starbucks_pay_in_floridaitxwd.pdfIn PDF document text
    • http://doorstepcomputers.com/297014261567vtef.pdfIn PDF document text
    • https://sukaxivex.weebly.com/uploads/1/3/4/8/134895869/xitinajulalenog.pdfIn PDF document text
    • https://liwevapazu.weebly.com/uploads/1/3/1/0/131071299/89c763.pdfIn PDF document text
    • http://politach.com/human_anatomy_for_artists_the_elements_of_formq0huy.pdfIn PDF document text
    • https://kasababafaraw.weebly.com/uploads/1/3/5/3/135336348/927188.pdfIn PDF document text
    • http://driveformclanemilwaukee.com/rirumivi8n2.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/gapuruxumeg/66486091333.pdfIn PDF document text
    • https://s3.amazonaws.com/megelugik/27024020678.pdfIn PDF document text
    • https://s3.amazonaws.com/baxegezivumi/what_are_the_principles_of_christian_faith.pdfIn PDF document text
    • https://s3.amazonaws.com/jeworurowam/51822827538.pdfIn PDF document text
    • https://s3.amazonaws.com/tomamujuf/lipogakusi.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_off00014b36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B36 5456 bytes
SHA-256: ab6eb1ba693f942e39a3ad1c20c5167e5a825183690b3e1eb91fce4646bd57a2
font_01_sfnt_off00015da8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DA8 12772 bytes
SHA-256: 845926050ee60f3eb15454c723d08da5da6596fe9d283dc96d2cee6561c9516c

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