Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcd702f9fc119512…

MALICIOUS

PDF

82.3 KB Created: 2021-04-02 01:01:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 9b3503268264c42a8aadd2d2d0996fc5 SHA-1: a308eb9346327637330bc71f189ad587d3fc7978 SHA-256: bcd702f9fc11951249bb8a100f0061ba8eedee6f91cdf234e01eb645963aa44d
194 Risk Score

Malware Insights

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

The PDF contains a large number of external links pointing to various PDF files hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=building+inspection+checklist+template+australia PDF link annotation
    • http://wegoluxetas.scienceontheweb.net/advanced_life_support_provider_manual.pdfIn PDF document text
    • http://gevenukodujojov.getenjoyment.net/safevemejotunedasikebaba.pdfIn PDF document text
    • http://rozujed.sportsontheweb.net/carding_amazon_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/fabetojowuje/b1RgHDA/vosirukuwiga.pdfIn PDF document text
    • http://tujijamutibe.sportsontheweb.net/32471793774.pdfIn PDF document text
    • http://xufonewujisos.scienceontheweb.net/guvasivabowedepivuloxe.pdfIn PDF document text
    • http://xibomupazone.mypressonline.com/cuales_son_los_auxiliares_del_comercio.pdfIn PDF document text
    • https://cdn.sqhk.co/jasamomedam/bgihjhk/r_infection_rate_germany.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a43ab9c2-5efb-4cee-ac06-b782a0f5e207.filesusr.com/ugd/4826f5_09b9cbc30eaf4ffeb5c31a7c0d6b1f01.pdf?index=trueIn PDF document text
    • http://dunoxoxuri.epizy.com/big_sean_songs_2019.pdfIn PDF document text
    • https://9ec55029-67b1-4fe0-9a5d-40fd638ac594.filesusr.com/ugd/dc5a51_f3f3a169849048758c8579605aff4f2a.pdf?index=trueIn PDF document text
    • http://toloruware.rf.gd/99788242550.pdfIn PDF document text
    • https://0315d410-4255-45a3-9477-873949dd02ac.filesusr.com/ugd/f85006_09a62e0b735149a7a17a1d4f2ebbb1a0.pdf?index=trueIn PDF document text
    • https://367e539a-c541-4439-991c-4bf2bef2aa7a.filesusr.com/ugd/77d535_afdc49a36b3945a293be09a88a88adca.pdf?index=trueIn PDF document text
    • https://d4180a97-8dd0-4bf1-9e2f-d1b128d1a64d.filesusr.com/ugd/ae059d_9ddcbac8f249461aa0ddb356a248ad83.pdf?index=trueIn PDF document text
    • http://satelit.rf.gd/55907157724.pdfIn PDF document text
    • https://3a7b682b-4b85-4b21-836a-a34929c8735b.filesusr.com/ugd/0cd3a8_e4e413e047314f8492ee72f4bc5227cd.pdf?index=trueIn PDF document text
    • http://jotavuwejopilo.rf.gd/robert_baratheon_meme_template.pdfIn PDF document text
    • https://f405dec1-7f90-4f4c-a861-5286f67d0127.filesusr.com/ugd/ab922d_aad81c28b487402baf9fae87df2ac799.pdf?index=trueIn 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_off00010078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10078 5600 bytes
SHA-256: e87efedf2404fc96d61c429095d1f0f2c5858c70d771edc186cb1613d97f8173
font_01_sfnt_off00011358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11358 11252 bytes
SHA-256: 2322943f5ff855a873f8c77a2f344a4e1ae2fac1845f044c7597f8affabd13b4