Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfd52aba90c20d24…

MALICIOUS

PDF

71.7 KB Created: 2021-04-23 00:42:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 5660a71a243ea0b64477753ef467afc9 SHA-1: ea5dbb5d8684a9a7e14397c1c2132ab94fdc9476 SHA-256: dfd52aba90c20d242a2e0fca921b7c1ffac8cf3079c6932a5128791949ba0334
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external links, many hosted on disposable domains, suggesting an attempt to manipulate search engine rankings or redirect users to malicious sites. The document body, though heavily obfuscated, appears to contain search terms related to 'John deere la135 deck belt diagram', indicating a lure for users searching for this information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://zajinet.ru/strik?utm_term=john+deere+la135+deck+belt+diagram PDF link annotation
    • http://kikababono.mywebcommunity.org/digital_marketing_bsc_london.pdfIn PDF document text
    • https://limorevoxa.weebly.com/uploads/1/3/4/6/134611026/2722331.pdfIn PDF document text
    • http://silvanozito.online/3845884210388k2i.pdfIn PDF document text
    • http://fiwisud.getenjoyment.net/80805351412.pdfIn PDF document text
    • http://lamaded.mywebcommunity.org/why_cant_i_wake_up_from_my_dreams.pdfIn PDF document text
    • https://duzinalanidik.weebly.com/uploads/1/3/4/7/134760416/a8e4127d.pdfIn PDF document text
    • https://fimezerix.weebly.com/uploads/1/3/4/4/134478386/cb69d8b.pdfIn PDF document text
    • http://jopagozopive.medianewsonline.com/60979401753.pdfIn PDF document text
    • https://fugikoji.weebly.com/uploads/1/3/4/6/134611078/vinerimezovuw.pdfIn PDF document text
    • https://sulomotosepotu.weebly.com/uploads/1/3/4/7/134744650/kisevinaw.pdfIn PDF document text
    • http://fabermanufacture.ru/acido_nitrico_ecuacion_quimica_balanceadauoifp.pdfIn PDF document text
    • https://puraxexi.weebly.com/uploads/1/3/4/7/134718411/kenanaselopip_xudixinad_kofube_xexadijexuwu.pdfIn PDF document text
    • https://xabonawof.weebly.com/uploads/1/3/5/9/135965837/fd07ee3f55eea.pdfIn PDF document text
    • http://daludaja.getenjoyment.net/vofajuginedilexukojud.pdfIn PDF document text
    • https://lexugorubu.weebly.com/uploads/1/3/0/7/130776619/zenibituro-wegop-zulapu-tivaxivozuj.pdfIn PDF document text
    • https://giwedogifuj.weebly.com/uploads/1/3/4/7/134741463/6e56a1b75cf.pdfIn PDF document text
    • http://health-top.ru/sony_dvd_player_dvp-sr210p_setup6nmr7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kufekisawisewo.onlinewebshop.net/candy_luke_davies_espaol.pdfIn PDF document text
    • http://rixuroruwe.myartsonline.com/12_cranial_nerves_and_function.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd14a498-1d0d-4c09-9343-c4ead29ebd2b/sagejozogofo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f949b9c6-1cb4-4011-9a59-ba1f20e66c10/asus_xonar_dgx_gaming_settings.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f773cf6-010c-4f9c-9081-61cb4308093b/misosobavibazinefud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/482cb7f2-7e99-49d1-bf7b-c920340f1ae7/beats_studio_3_replacement_ear_pads_apple.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8f93593-62d9-4f8a-8547-bbf6ab458533/fender_super_champ_x2_head_vs_combo.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_off0000d7f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F5 5708 bytes
SHA-256: aeb55cdacd79d20097b29a29be6af5f81f76d4a1f97548ddfcb6709072529a8b
font_01_sfnt_off0000eb39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB39 10732 bytes
SHA-256: 8b561a7096427ed0e7ae9dd27142a4d2f0937441844b605adcdec581c1d042be