Malicious PDF — malware analysis report

Static analysis result for SHA-256 de79a28fc6138087…

MALICIOUS

PDF

85.9 KB Created: 2021-02-16 04:56:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: eaaf8b7373d6041324e67ccbecab9ab7 SHA-1: 4e2e80ff60ea5fda7c89a72223bbb8fd2fae0799 SHA-256: de79a28fc6138087a9dbef941441dfba6dc80e1fb709cb0f65ed88fab9a45d51
194 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. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to direct users to potentially malicious content. The presence of a 'download' button lure further supports the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://baarspo.ru/123?utm_term=rslogix+5000+plc+software+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4473919/normal_602a41f1f141e.pdfIn PDF document text
    • https://dubanivexog.weebly.com/uploads/1/3/4/3/134331992/fujokiro.pdfIn PDF document text
    • http://natur-bio.space/always_be_my_maybe_parents_guidewjyf5.pdfIn PDF document text
    • http://sberbank.services/civ_5_mods_multiplayer0nqui.pdfIn PDF document text
    • http://microbladingeyebrowsdallastx.com/arere_ekkada_ekkada_na_pranam_song9jur3.pdfIn PDF document text
    • https://babotiditufo.weebly.com/uploads/1/3/4/6/134694550/7c3b9.pdfIn PDF document text
    • http://vipogomer.iblogger.org/caballo_de_troya_gratis_libro.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477156/normal_601f88913e3b7.pdfIn PDF document text
    • https://kubazabuz.weebly.com/uploads/1/3/4/8/134885093/7150237.pdfIn PDF document text
    • https://jarowezib.weebly.com/uploads/1/3/0/8/130813985/4222bd.pdfIn PDF document text
    • http://menedowu.iblogger.org/6206366847.pdfIn PDF document text
    • http://amandeepsadyora.com/simisilunikilirezedekawinjvg46.pdfIn PDF document text
    • https://tomanudiz.weebly.com/uploads/1/3/1/6/131606325/wobagoji.pdfIn PDF document text
    • https://ponawexem.weebly.com/uploads/1/3/2/7/132740185/jebegegufanizo_fewipugibib.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372673/normal_5feb9765d99c2.pdfIn PDF document text
    • https://ramemegu.weebly.com/uploads/1/3/1/3/131383760/wenevipum.pdfIn PDF document text
    • https://kunolutupevuj.weebly.com/uploads/1/3/4/7/134772201/govubixaka.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://mosakokomu.epizy.com/gebetokowutedukaxidet.pdfIn PDF document text
    • http://nikejubefip.epizy.com/patjhad_sawan_basant_bahar_dj_song.pdfIn PDF document text
    • https://s3.amazonaws.com/vipuxafol/fiche_de_poste_assistant_rh_formation.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA96 5544 bytes
SHA-256: 1b87a5e6546f5fb4c2fe3e67c0ec65d9352dd5a45f823a399219ad0a929213a2
font_01_sfnt_off0000fd8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8C 8064 bytes
SHA-256: 3230bf31cc6763d4f6a92b35e764bc5e226886b13523f202f6a949745ebc06c8
font_02_sfnt_off000113f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F0 11060 bytes
SHA-256: e8651cdca25ac8630d6d55449cb2686ece18c8c60c811a921330a12c8df81005
font_03_sfnt_off00013979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13979 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e