Malicious PDF — malware analysis report

Static analysis result for SHA-256 a82b7cedf479bdd2…

MALICIOUS

PDF

76.9 KB Created: 2021-02-21 08:53:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2f5267233e4abd75bf891ecb939cd075 SHA-1: 93e00277b613d0e2dc6a573309ca30de12cab760 SHA-256: a82b7cedf479bdd20ea18acc9965cd0deac94deaa5d0d1e4435f4b63878de1a4
186 Risk Score

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 0.9998

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/wix?keyword=beastars+episode+5+reddit PDF link annotation
    • https://bofujobepoj.weebly.com/uploads/1/3/1/1/131164048/656963.pdfIn PDF document text
    • https://tisemadu.weebly.com/uploads/1/3/4/3/134387657/wagulogunosojor.pdfIn PDF document text
    • https://malugeko.weebly.com/uploads/1/3/1/6/131636988/30f0fc80126ea.pdfIn PDF document text
    • https://cdn.sqhk.co/rujosupatebu/A5jdihO/survive_wilderness_survival_paid_apk.pdfIn PDF document text
    • https://rojirewika.weebly.com/uploads/1/3/2/7/132710632/wedijugafepokug.pdfIn PDF document text
    • https://kitedagipan.weebly.com/uploads/1/3/4/8/134892955/nubeb-kojosijoluwo-weronalukax-pobabubuvininis.pdfIn PDF document text
    • https://pupalizote.weebly.com/uploads/1/3/4/7/134716330/4f65ec53.pdfIn PDF document text
    • https://kusigalodedi.weebly.com/uploads/1/3/5/9/135965864/7c404134c6d0b.pdfIn PDF document text
    • http://vugijow.iblogger.org/call_of_duty_mobile_apk_data_latest.pdfIn PDF document text
    • https://gupovokezatiku.weebly.com/uploads/1/3/4/8/134878629/supifaxinetu.pdfIn PDF document text
    • https://cdn.sqhk.co/disegivoji/gfgehbY/zizajomek.pdfIn PDF document text
    • https://baxopaparoxiw.weebly.com/uploads/1/3/1/4/131454316/dozezowimuw.pdfIn PDF document text
    • https://rinulokol.weebly.com/uploads/1/3/4/8/134868038/zufobatab.pdfIn PDF document text
    • https://gojatoxemoniro.weebly.com/uploads/1/3/4/8/134894745/ee57ea.pdfIn PDF document text
    • https://gumarifubora.weebly.com/uploads/1/3/4/4/134465571/kibaxovaxevuzakuni.pdfIn PDF document text
    • https://cdn.sqhk.co/dijowasedop/jPDDwid/mefelilomerezono.pdfIn PDF document text
    • https://cdn.sqhk.co/genopeno/J1Njggd/zivefifofopedu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zarusegibitumet/pre_college_algebra_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/regufojalojaza/biostratigraphy_lab_answers.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_off0000efea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEA 5096 bytes
SHA-256: b7dbef1c2d2eef540b0a3ae5a6488692eb1c959187cb1cfe48557fe2c636c1b0
font_01_sfnt_off0001014d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014D 10884 bytes
SHA-256: bac2fc05ea35c5ca09f2094003fbdb3948479846c0de179de929e260ab7c67b9

Open this report in the interactive analyzer, or submit your own file for analysis.