Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e4b4a1b623b8019…

MALICIOUS

PDF

87.6 KB Created: 2021-04-23 18:27:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 26116aaf247d78615f1450b286fcb97c SHA-1: 1ab8a65f73ab72f66aa1acd4bb1bcf8c3d20c631 SHA-256: 3e4b4a1b623b80196f1bead96ae591a05a9d20087c00b61a3ba73219c3164fe4
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 hosted on disposable domains, suggesting a link farm designed to direct users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were extracted, the PDF structure and embedded URLs point to a common tactic of using documents as bait for external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://dafemum.ru/strik?utm_term=hyd-mech+s-20p+parts+manual+pdf
    • http://vexetifiridik.mypressonline.com/fusionner_2_jpg_en_1.pdf
    • https://cdn-cms.f-static.net/uploads/4413697/normal_6056fb7f243ba.pdf
    • https://lazumuron.weebly.com/uploads/1/3/4/8/134863931/cbe9815bbd1a50.pdf
    • http://rowowevu.mypressonline.com/sinokalama.pdf
    • https://nisazixipa.weebly.com/uploads/1/3/0/7/130775104/roburoxekevowuzox.pdf
    • https://static.s123-cdn-static.com/uploads/4498978/normal_5ff5096d3233b.pdf
    • http://zokiwedilar.mypressonline.com/alesis_q49_manual.pdf
    • https://static.s123-cdn-static.com/uploads/4414502/normal_5feb92fa85cfd.pdf
    • http://fikakutipid.mygamesonline.org/psc_bulletin_diamond_jubilee_edition.pdf
    • https://diruwogedow.weebly.com/uploads/1/3/1/3/131382439/gudugem.pdf
    • https://vugogirofezufus.weebly.com/uploads/1/3/4/3/134355312/5944803.pdf
    • http://feludekinopotas.scienceontheweb.net/copper_oxide_nanoparticles_applications.pdf
    • https://tavovoxiwazufaj.weebly.com/uploads/1/3/5/3/135325502/falog.pdf
    • http://poxumanavofeboz.scienceontheweb.net/norelco_5000_nose_trimmer.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://8ed6bd9f-de2b-4923-b7df-82f95eb18a03.filesusr.com/ugd/7fa32f_c94050acf2754da2b4ee67c2d5b267d9.pdf?index=true
    • http://dasiletu.epizy.com/zowujud.pdf
    • https://5e7fdb44-65a6-4d88-9b36-b69c04d36e08.filesusr.com/ugd/b547b4_2edf57e0133849618688d82f417fc7fc.pdf?index=true
    • http://tameladizikep.atwebpages.com/monevolivaxuvarewubewos.pdf
    • http://tikinupuworate.rf.gd/zen_mind_beginner_s_mind_by_shunryu_suzuki.pdf
    • http://kubomefewofumim.atwebpages.com/gokugadosibanuxug.pdf
    • http://wegamaluperetuj.atwebpages.com/55575153921.pdf
    • http://powagamojij.onlinewebshop.net/define_absolute_humidity.pdf
    • http://dubomebivenu.epizy.com/awards_and_honours_2020_19_download.pdf
    • http://gagarereforer.epizy.com/ias_zoology_syllabus_2017.pdf
    • https://41c240d9-b4af-4f88-8fa4-2a41cce3a287.filesusr.com/ugd/01bc73_02cfca2d43034028b541fe6f0cdaba43.pdf?index=true
    • http://tovezujatim.rf.gd/cell_broadcast_message_android.pdf
    • https://d8acad56-eb9a-42d1-a06c-a695c5b02328.filesusr.com/ugd/0ad6c7_5e019a8a2b6e4a6fbc928c4c21b9e312.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010774.bin
131dd0204858485fac065b4ad14345dfa347959beae5518318436a74e09b0c93
pdf-font-stream PDF embedded font (sfnt) at offset 0x10774 5488 bytes
font_01_sfnt_off000119fe.bin
d187b113fd10b9740e1242c5bcb521b1563694617ec183882b5810ee740e386e
pdf-font-stream PDF embedded font (sfnt) at offset 0x119FE 11496 bytes
font_02_sfnt_off000140fb.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
pdf-font-stream PDF embedded font (sfnt) at offset 0x140FB 4324 bytes