Malicious PDF — malware analysis report

Static analysis result for SHA-256 03e6b1a941b49d61…

MALICIOUS

PDF

82.0 KB Created: 2021-03-20 04:09:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: c3126dd385992b7fa49fbde22d75c67f SHA-1: ec0d5576898840498b90c9eaebaa985d940927db SHA-256: 03e6b1a941b49d61160cfff4b7a04d29147a24618486d0eb4b23f9603b5d7138
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a ClamAV signature and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous external URLs, many of which are hosted on disposable domains or redirectors, suggesting a phishing or malware distribution scheme. The embedded document body, though truncated, appears to be a lure related to statistical exercises, likely to entice users to click on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://bologen.ru/strik?utm_term=ejercicios+resueltos+de+estadistica+moda+mediana+y+media+en+excel PDF link annotation
    • https://nurufumetexode.weebly.com/uploads/1/3/5/3/135323779/26db7d523ee.pdfIn PDF document text
    • http://reznitskygallery.com/jupirolozeraxakogaf7k39.pdfIn PDF document text
    • https://fabuduviwanor.weebly.com/uploads/1/3/4/7/134739750/wazive-wofalanudobemo.pdfIn PDF document text
    • http://lassituda.online/vemudalazulanumivo9addd.pdfIn PDF document text
    • http://bigpleasure.ru/737187806432u0id.pdfIn PDF document text
    • http://circulshtangcalip.website/hp_officejet_7110_printer_ink05wzh.pdfIn PDF document text
    • http://okstore.info/gta_heist_guideztj7u.pdfIn PDF document text
    • https://fuguweraxawu.weebly.com/uploads/1/3/4/6/134684603/1572581.pdfIn PDF document text
    • https://bumozirejukije.weebly.com/uploads/1/3/5/3/135340746/kavomu.pdfIn PDF document text
    • https://mawajajapok.weebly.com/uploads/1/3/4/3/134353668/redepigupos_fadis_fowoxogus_dupuxolerobujev.pdfIn PDF document text
    • http://gidpopiteru.com/73233470480wd3gh.pdfIn PDF document text
    • https://watumuguv.weebly.com/uploads/1/3/2/6/132695830/4f7a540deaf0cd1.pdfIn PDF document text
    • https://gisonegeviwobi.weebly.com/uploads/1/3/1/3/131383673/8401152.pdfIn PDF document text
    • http://cocobeautybar.ca/vidmate_old_version_2._28_for_iphonewgc18.pdfIn PDF document text
    • https://ragurinibobuma.weebly.com/uploads/1/3/3/9/133986244/danepepotuwor.pdfIn PDF document text
    • https://lilufegat.weebly.com/uploads/1/3/5/9/135965666/fofikitileliki-fosivo-jukitetajorer-tanedid.pdfIn PDF document text
    • http://creampiepow.club/777439535335x55t.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/59aec27d-d8b7-41ec-8164-25dde12402b6/85225728434.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8844007c-e18f-4e88-ba9a-235a84a1f8c2/25753035830.pdfIn PDF document text
    • https://a694a867-b0fa-45cd-b082-7f9abf80b1a7.filesusr.com/ugd/430cb2_7c9a18b049ae4d81934b0e08356d4fba.pdf?index=trueIn PDF document text
    • https://9e77dbea-16d6-438e-9859-4a68c5388828.filesusr.com/ugd/3225da_47a3218efa294ad391aab9396917fb3b.pdf?index=trueIn PDF document text
    • https://e06e8306-d71e-4c92-aa1b-e8c52eeb44cb.filesusr.com/ugd/bc4951_4c48b6e6cafa4434a3594f9e5f4966ed.pdf?index=trueIn PDF document text
    • https://cf336f9a-6a79-4542-9269-5b62d6eb69dd.filesusr.com/ugd/1daf83_8ae55acc585843baa8fb945d1bf8ad37.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/65efa214-9026-4616-8650-7fd88be54b5a/why_does_my_oscillating_sprinkler_get_stuck.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fabad7b-5ea7-4008-8e36-7902715ec8fd/oppo_bdp-103d_manual.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE79 5168 bytes
SHA-256: 6057a321fa88526c6c8830693a27acfed40958961a82e59ea48d318c135c8033
font_01_sfnt_off00010002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10002 12752 bytes
SHA-256: 0a476c979e3c9a830df1ac68c04cb50450470fce74d308679f4749cd9cb2ad9d
font_02_sfnt_off000129c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C5 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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