Malicious PDF — malware analysis report

Static analysis result for SHA-256 27af353bc2826e70…

MALICIOUS

PDF

85.6 KB Created: 2021-02-23 05:40:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 246295057f05319c76d4b9019d0a900d SHA-1: d2825206b44cb495aaa2ec7bdcfb3b4d5bd5b72d SHA-256: 27af353bc2826e7030f99fb3fa8b074373fd6c56edd1401c3b2838e61ba52dec
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-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://bologen.ru/wix?keyword=access+nested+iif+syntax PDF link annotation
    • https://cdn.sqhk.co/gajeneset/DqjggeY/via_afrika_business_studies_grade_11_textbook.pdfIn PDF document text
    • https://cdn.sqhk.co/rizonozugaj/7hjrvky/deals_direct_birmingham_ltd.pdfIn PDF document text
    • https://senekuzoje.weebly.com/uploads/1/3/5/9/135978249/49fe4a25f7f8c2a.pdfIn PDF document text
    • https://tulixepatezapik.weebly.com/uploads/1/3/4/9/134902644/xanemovijituda-rujel-zupada.pdfIn PDF document text
    • https://cdn.sqhk.co/nugegigoxaxe/TAqrjj4/9343778983.pdfIn PDF document text
    • https://cdn.sqhk.co/razilipot/fvdGgfu/munik.pdfIn PDF document text
    • https://sobapeseg.weebly.com/uploads/1/3/1/0/131070394/muxodef-guvinenirulusen-lopiliwisugo-fajemuluw.pdfIn PDF document text
    • https://famonusowofem.weebly.com/uploads/1/3/4/3/134349488/7795708.pdfIn PDF document text
    • https://jotitotibewava.weebly.com/uploads/1/3/1/3/131383271/4be382d59c2bd.pdfIn PDF document text
    • http://pojorabe.iblogger.org/husqvarna_hu700h_air_filter_part_number.pdfIn PDF document text
    • https://cdn.sqhk.co/baruduwege/Nhegegd/sogipopixuwavi.pdfIn PDF document text
    • https://cdn.sqhk.co/dilobowuz/ibrjbjd/69845011148.pdfIn PDF document text
    • https://gunubamevozapub.weebly.com/uploads/1/3/3/9/133997290/9273584.pdfIn PDF document text
    • https://zesoxomilojul.weebly.com/uploads/1/3/4/0/134018604/bufekuxufet.pdfIn PDF document text
    • https://vuzavadakugodo.weebly.com/uploads/1/3/4/8/134857872/kuwudowoborelawi.pdfIn PDF document text
    • https://dujomujur.weebly.com/uploads/1/3/4/8/134883281/jedobagadida.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/fatisake/centrifugal_pump_piping_design_layout.pdfIn PDF document text
    • http://dojidusajotat.epizy.com/bratz_logo.pdfIn PDF document text
    • https://s3.amazonaws.com/nawosineromigi/kiinde_kozii_bottle_warmer_vs_tommee_tippee.pdfIn PDF document text
    • https://s3.amazonaws.com/degisapemifa/28290182082.pdfIn PDF document text
    • http://vulikoviluxugu.rf.gd/kalexuwosiwalabusevotaze.pdfIn PDF document text
    • https://s3.amazonaws.com/pulujolatepuv/57291273768.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_off0001066b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066B 5044 bytes
SHA-256: f7a790d879da8a8035005a7e5c6496533247e965ae95d02bea28864b5fe522e0
font_01_sfnt_off000117bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117BD 15708 bytes
SHA-256: 5af5b061049ab02274155f0c5300c1a2ea4f17a0232674f98bee2886d6d322f3

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