Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6b34bfbcf5f24b4…

MALICIOUS

PDF

87.6 KB Created: 2021-03-23 14:09:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: fb4015b9ca05142d8ceb2e1ae008ae39 SHA-1: 0328bead5bd6799211ca584f9d813220c92d4243 SHA-256: e6b34bfbcf5f24b45c87fa0d95c64362a94bc3a03861e7b0614a539109dbb0d7
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains and link farms, indicating a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly suggest malicious intent. The document body, though heavily obfuscated, suggests a lure related to employment applications, aligning with the PDF_SEO_LINK_FARM heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://midufefew.ru/123?utm_term=employment+application+form+california+template PDF link annotation
    • https://cdn.sqhk.co/zolulesar/hbYidQp/lominozuri.pdfIn PDF document text
    • http://onenature.space/tufimujuwekorodikoz2y1mw.pdfIn PDF document text
    • https://cdn.sqhk.co/tezesafura/7jdoifv/gexobomawamiretapap.pdfIn PDF document text
    • https://cdn.sqhk.co/mozedizupi/ge9haRt/billie_eilish_my_future_spotify.pdfIn PDF document text
    • https://cdn.sqhk.co/kusedesomawa/gfk56ji/drag_racing_cars_for_sale.pdfIn PDF document text
    • https://pafirovax.weebly.com/uploads/1/3/4/6/134662293/tikap-nipajegubibaxed-senutu.pdfIn PDF document text
    • https://cdn.sqhk.co/jidulopavoji/idddy5O/trate_de_olvidarte_in_english.pdfIn PDF document text
    • http://fortuneo.biz/where_can_i_go_for_a_mental_evaluation75e7k.pdfIn PDF document text
    • http://resimpub.com/japome2fpp6.pdfIn PDF document text
    • http://exampl1214.com/80004208181yuasz.pdfIn PDF document text
    • https://nunoperiv.weebly.com/uploads/1/3/1/8/131856708/wikewemel-pusixewa-pasexefizebo-buxug.pdfIn PDF document text
    • https://xibabajawaxas.weebly.com/uploads/1/3/1/3/131398380/bovufawakemikamukawu.pdfIn PDF document text
    • https://cdn.sqhk.co/losiluja/gjcgiJS/sekelumijegux.pdfIn PDF document text
    • https://cdn.sqhk.co/zolilogifuxe/ejjAihn/masterminds_true_story_facts.pdfIn PDF document text
    • https://cdn.sqhk.co/niwonosorude/iiMie2O/88564208020.pdfIn PDF document text
    • https://cdn.sqhk.co/gulaxemetila/ghjczic/8424905653.pdfIn PDF document text
    • https://cdn.sqhk.co/rexadiwixox/aJih2OQ/56324285410.pdfIn PDF document text
    • https://lerojapozexux.weebly.com/uploads/1/3/4/0/134016693/aadb2e7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wisexek.epizy.com/zajivalara.pdfIn PDF document text
    • http://bilelixolivip.rf.gd/dapovus.pdfIn PDF document text
    • http://xolisijepe.rf.gd/vehicle_chassis_design.pdfIn PDF document text
    • http://womogesupepup.epizy.com/project_management_software_free.pdfIn PDF document text
    • http://najaxobefirag.epizy.com/5459663209.pdfIn PDF document text
    • http://laxizibobi.rf.gd/facial_nerve_disorders_and_diseases_diagnosis_and_management.pdfIn PDF document text
    • http://fepoxojosatomu.epizy.com/romanesque_church_architecture.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_off000118df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118DF 5044 bytes
SHA-256: 32d84c30baa40a2ad12c190d10edb9a87fe19b7e70888082add1efb01cfe8c81
font_01_sfnt_off000129ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129FF 11336 bytes
SHA-256: b14ac3515d99bca8cddb11f787c463707463e5043dba0ff431ba6b88e7db9f0a