Malicious PDF — malware analysis report

Static analysis result for SHA-256 1664dc5399aa4528…

MALICIOUS

PDF

72.8 KB Created: 2021-03-27 10:23:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 183511654eaef247f70102247d67f81c SHA-1: 5fccdcaa4b562aff78f70422314534ff62157085 SHA-256: 1664dc5399aa45286cb526204def3172ef53ac7503159c11a87100be454f8ba4
186 Risk Score

Malware Insights

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

This PDF document functions as a link farm, directing users to numerous external websites, many of which are hosted on disposable domains. The primary lure appears to be 'serial number guidelines', suggesting a phishing or scam attempt. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of malicious intent, likely to lead users to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • 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://kuzutuzo.ru/wix?keyword=serial+number+guidelines PDF link annotation
    • http://lofajemami.sportsontheweb.net/53493801.pdfIn PDF document text
    • https://lisogawe.weebly.com/uploads/1/3/5/3/135312855/2387500.pdfIn PDF document text
    • https://munerotilaxamo.weebly.com/uploads/1/3/4/4/134476206/numubalaludej.pdfIn PDF document text
    • https://dofuzubakav.weebly.com/uploads/1/3/1/6/131606612/kuxogovub.pdfIn PDF document text
    • https://vafumesaz.weebly.com/uploads/1/3/4/5/134589630/jofugu.pdfIn PDF document text
    • https://lukogazusewof.weebly.com/uploads/1/3/4/6/134643336/b4a8d8c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381756/normal_6039b8561bf18.pdfIn PDF document text
    • https://fiwozipuwawew.weebly.com/uploads/1/3/0/8/130814157/7711407.pdfIn PDF document text
    • https://wudusalulolatus.weebly.com/uploads/1/3/1/6/131606476/xagomewofidutuw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465024/normal_5ff516a03deb3.pdfIn PDF document text
    • http://zipafaxelati.sportsontheweb.net/jaluvitubebunujed.pdfIn PDF document text
    • https://lasebotoxuxuxir.weebly.com/uploads/1/3/4/7/134729765/8506799.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jobiduleger.epizy.com/mini_sewing_machine_service_centre_near_me.pdfIn PDF document text
    • https://acfcda0b-1795-4b40-aedc-9a0bc13047ce.filesusr.com/ugd/89c6ad_bff77447f63b4ca0b2ecdeb252758528.pdf?index=trueIn PDF document text
    • https://4bf641bf-117a-4913-931f-55e49063997f.filesusr.com/ugd/5befcb_38acb7723ee84443b39fe58b9d33beec.pdf?index=trueIn PDF document text
    • http://kibululugavi.epizy.com/bemilurolewubirumilo.pdfIn PDF document text
    • http://kewevagisugimuw.onlinewebshop.net/62045064026.pdfIn PDF document text
    • https://b86313a8-447b-404d-ae6d-bc69740d899e.filesusr.com/ugd/e54fc7_ae97ecb549ed47fa8a1b0e37ec51634f.pdf?index=trueIn PDF document text
    • http://lenawukefiraba.rf.gd/tcs_ninja_aptitude_questions_and_answers_2020.pdfIn PDF document text
    • https://0879403c-3be5-48e4-925f-21334a7d5cfe.filesusr.com/ugd/407fcc_5d53fb842e624d429afe964ebb4febdc.pdf?index=trueIn PDF document text
    • http://dulubuli.rf.gd/61791834015.pdfIn PDF document text
    • https://d064ede3-316f-4d13-8ec5-014b2136b3bd.filesusr.com/ugd/154db6_27e284e9f0934a7ba2fd2de4c84e752a.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_off0000de90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE90 5388 bytes
SHA-256: 6a383b78644b314ae431d02c95a8058d5f494e4e0e67189a33cfa6419a9b257a
font_01_sfnt_off0000f0bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BD 10748 bytes
SHA-256: bf3162de2121524e48478ca221b51dceee3ad3a2b44fce85a66f77b7627773e2