Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9145bb3e0ba0672…

MALICIOUS

PDF

72.7 KB Created: 2021-01-21 12:05:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 0bd1c9aaebb7cafadf4a7cc96253dde7 SHA-1: 76cf7bfdbf01fc73a2e76368454a29b02ce7af75 SHA-256: e9145bb3e0ba067293f3c4b2ad94410b8d5f1d2c5683b4c3b3b51dc115c079a6
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, identified as a link farm, with many pointing to disposable hosting services. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest it's designed to redirect users to malicious sites.

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://leonvi.ru/123?utm_term=la+leche+de+soya+engorda PDF link annotation
    • https://site-1172679.mozfiles.com/files/1172679/pulirelokofu.pdfIn PDF document text
    • https://pesawuzopedeg.weebly.com/uploads/1/3/5/3/135327269/2054454.pdfIn PDF document text
    • https://dalagusixofu.weebly.com/uploads/1/3/4/8/134853238/bowekopefuw_bininikot_kajutix.pdfIn PDF document text
    • https://jupavovol.weebly.com/uploads/1/3/4/3/134314217/vefalovuropodaxon.pdfIn PDF document text
    • https://pavexoseg.weebly.com/uploads/1/3/5/3/135315086/femuzomeripu.pdfIn PDF document text
    • https://site-1175480.mozfiles.com/files/1175480/class_11_chemistry_iit_jee_neet_aiims_2020.pdfIn PDF document text
    • https://woxukobu.weebly.com/uploads/1/3/4/3/134392577/lotekozororetijoga.pdfIn PDF document text
    • http://tosufiloxosi.66ghz.com/enumerated_goods_group_of_answer_choices.pdfIn PDF document text
    • http://vuzopozakobepe.22web.org/gulugazesuwedemo.pdfIn PDF document text
    • https://lumigoxodavi.weebly.com/uploads/1/3/1/6/131606620/vojimuv-ruvuduzo.pdfIn PDF document text
    • https://site-1173990.mozfiles.com/files/1173990/75745982108.pdfIn PDF document text
    • https://xepevuke.weebly.com/uploads/1/3/0/7/130775471/sewarukej-furamex-wugitinon-ferufiweruza.pdfIn PDF document text
    • https://gakewejodum.weebly.com/uploads/1/3/4/9/134902465/9600066.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sokagozu.rf.gd/nrcan_fuel_consumption_guide_2014.pdfIn PDF document text
    • http://latowetutut.epizy.com/23105375997.pdfIn PDF document text
    • http://ledolabufimo.epizy.com/65888494077.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_off0000de53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE53 5244 bytes
SHA-256: 608ee608f2d988a8e24b3a999cf2c29cfeb75d6824f6ae0d52833b71973693e0
font_01_sfnt_off0000f027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF027 11172 bytes
SHA-256: 9ee1b560468adc5125d46a77ecac2d9bc3b7d9ae1fbc49b5e673fd30d37b2ed6

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