Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1a37e711c780483…

MALICIOUS

PDF

79.5 KB Created: 2021-04-05 14:19:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 4d2a4f11bb17c4c5e1e805086fe91e80 SHA-1: e99b609ed73d8ae3ca24c90a25cc9cbb81f5d9d2 SHA-256: a1a37e711c7804833e5ea2fa728787058d92767bbaf39be05aa0e15528bbd05a
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 0.9996

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://seumenha.ru/123?utm_term=panda+antivirus+linux+free PDF link annotation
    • http://womovenum.sportsontheweb.net/vepejemojokigorofuza.pdfIn PDF document text
    • http://kolagozisil.mywebcommunity.org/88873769804.pdfIn PDF document text
    • https://bevozuvegala.weebly.com/uploads/1/3/3/9/133999301/2165f2ff2b4f049.pdfIn PDF document text
    • https://jukorupojos.weebly.com/uploads/1/3/5/3/135344641/af1343.pdfIn PDF document text
    • https://cdn.sqhk.co/fufigavaki/ggdjjfr/usa_today_sports_nfl_draft.pdfIn PDF document text
    • https://sobafezusebe.weebly.com/uploads/1/3/5/3/135335887/62088b072.pdfIn PDF document text
    • https://limikasideg.weebly.com/uploads/1/3/4/4/134446439/kumefo.pdfIn PDF document text
    • https://cdn.sqhk.co/fedovipawe/hgKjagc/the_loopers_boating.pdfIn PDF document text
    • https://retorize.weebly.com/uploads/1/3/0/9/130969817/9323566.pdfIn PDF document text
    • https://zigamebujadosa.weebly.com/uploads/1/3/4/7/134745820/e765b37a37.pdfIn PDF document text
    • http://felesatediz.medianewsonline.com/75119173362.pdfIn PDF document text
    • http://zevupixikug.mywebcommunity.org/mopuzusovopimasenuzifufa.pdfIn PDF document text
    • http://warajuvevuv.medianewsonline.com/xomopeluxaxelazenas.pdfIn PDF document text
    • https://rutebesutev.weebly.com/uploads/1/3/4/1/134131531/zodojeraruwudud.pdfIn PDF document text
    • http://balegetiwep.mywebcommunity.org/kamusuzodafagidugukumedup.pdfIn PDF document text
    • http://xozowilozoga.mywebcommunity.org/vebol.pdfIn PDF document text
    • https://cdn.sqhk.co/dodalowogiv/cYgdgjY/fejoxoziwonulokipatili.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/pevarijidasalop/78202544079.pdfIn PDF document text
    • https://s3.amazonaws.com/wefemabeni/pobijapalupesibusadipazut.pdfIn PDF document text
    • https://s3.amazonaws.com/xeponodij/low_back_pain_arthritis_uk.pdfIn PDF document text
    • http://lumosaneja.onlinewebshop.net/vobajorebinetigola.pdfIn PDF document text
    • http://desigaweru.myartsonline.com/musezirixefe.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_off0000fa04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA04 5032 bytes
SHA-256: 45cb61506d91e0520f7bd211940d07f6d5aa5d803a72cb08230030ea45fa6ad7
font_01_sfnt_off00010b37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B37 11064 bytes
SHA-256: 5bbb8055006d4d714714e64f12509aa0099f6ad86e0136120924b8a82e16cc5b

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