Malicious PDF — malware analysis report

Static analysis result for SHA-256 8211a2baedf4da2c…

MALICIOUS

PDF

76.1 KB Created: 2021-05-28 20:31:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 9620b2ba0bb367e72aa79a34e02c3327 SHA-1: 945c0257352cb5330cbcf8302ffdf9608766562e SHA-256: 8211a2baedf4da2c0403bd2e2a11fa645b15d8fbba36204fadd4ef5daefb1f56
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/strik?utm_term=how+to+download+minecraft+for+free+windows+10+2019 PDF link annotation
    • https://vebiponexuxewi.weebly.com/uploads/1/3/4/7/134758887/acbdb01da.pdfIn PDF document text
    • https://pifelitasa.weebly.com/uploads/1/3/5/3/135350032/ditakar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380090/normal_60631289c5c93.pdfIn PDF document text
    • https://ridewavovelomu.weebly.com/uploads/1/3/4/6/134697160/6481104.pdfIn PDF document text
    • https://rurodakol.weebly.com/uploads/1/3/4/6/134646116/6c0442.pdfIn PDF document text
    • https://fozipomeripimak.weebly.com/uploads/1/3/4/6/134610298/1913820.pdfIn PDF document text
    • https://motikefivenigem.weebly.com/uploads/1/3/4/7/134709332/55ce0d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497109/normal_60126dfb9ae51.pdfIn PDF document text
    • https://navanelesud.weebly.com/uploads/1/3/0/9/130969746/sikiwedag_megef_fixumusulaf.pdfIn PDF document text
    • https://rujedupexiveviz.weebly.com/uploads/1/3/4/8/134874221/diwimivite.pdfIn PDF document text
    • https://ruwuzeget.weebly.com/uploads/1/3/4/7/134755445/5546164.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484633/normal_606247771431e.pdfIn PDF document text
    • https://kupelaranix.weebly.com/uploads/1/3/4/7/134729830/zikidusonul-supizixodo-jaforofunavikur-razubigo.pdfIn PDF document text
    • https://velupilarase.weebly.com/uploads/1/3/5/3/135341581/12c026.pdfIn PDF document text
    • https://volifinidolil.weebly.com/uploads/1/3/0/8/130873876/rekuzevokulem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377662/normal_6034e9672e8e4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbd23b67-a781-4556-a174-2a9aaf354dd4/what_motivated_european_exploration.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec5d3579-29e5-447b-9495-ac6085b1d647/tru_mini_crock_pot_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f698530-2aba-4d3f-aff2-16a6f52e458e/how_to_get_car_loan_statement_from_sbi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c60a67e4-63c1-43eb-87fc-18fd41bf9d76/past_modal_verbs_english_exercises_online.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_off0000edb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB2 5700 bytes
SHA-256: bd072cf3157c5821afa0ad4c8b39732105ad936dbfe0ab60c699b7ca5e3289be
font_01_sfnt_off00010111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10111 10000 bytes
SHA-256: 103d81889574adc479aa16be54311981929ad3e09d0c615d5ebcc9fc496de2ce

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