Malicious PDF — malware analysis report

Static analysis result for SHA-256 c996a35ade82965a…

MALICIOUS

PDF

81.1 KB Created: 2021-03-31 06:15:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 2459789c18584917092f932825636994 SHA-1: ef3d8b6122176328cddab84ec3e0ac8b478e122e SHA-256: c996a35ade82965abf71580c9029bdfa9d2c981c3e8e1ec4908757849c7d5682
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially harmful websites. The embedded URLs and the heuristic findings point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://midufefew.ru/award?keyword=kaufland+ak%25C4%258Dn%25C3%25AD+let%25C3%25A1k+pdf PDF link annotation
    • https://fibetenozogu.weebly.com/uploads/1/3/0/8/130813768/xunikijipelak.pdfIn PDF document text
    • https://buwofapakudo.weebly.com/uploads/1/3/5/3/135316190/pidodabofal.pdfIn PDF document text
    • https://volufijipezuji.weebly.com/uploads/1/3/4/7/134703795/5106c12b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373776/normal_604f7c728b004.pdfIn PDF document text
    • https://tevidozeji.weebly.com/uploads/1/3/4/8/134887032/dopefuxobu-pugotazo-wejabutejo.pdfIn PDF document text
    • https://jerepuda.weebly.com/uploads/1/3/4/7/134745202/pevej_fagaronuxen_mevusexoxevilit_zaxovorusozola.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446286/normal_60209704434fd.pdfIn PDF document text
    • http://tesiwonogi.iblogger.org/nike_wmns_air_force_1_pixel_chain_summit_white.pdfIn PDF document text
    • https://ponebivilu.weebly.com/uploads/1/3/4/5/134505494/fakufem-dimag-kavunezawoso.pdfIn PDF document text
    • https://vidafipi.weebly.com/uploads/1/3/1/6/131636743/971110.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368235/normal_60494c80ed361.pdfIn PDF document text
    • https://voteriboxovoviv.weebly.com/uploads/1/3/4/3/134352377/lusezituzulomo-gaxisosibofip.pdfIn PDF document text
    • https://babipuwoze.weebly.com/uploads/1/3/4/8/134865032/gurelivez-luvosap.pdfIn PDF document text
    • http://wikuseweluwi.iblogger.org/bloqueo_av_de_3er_grado.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495055/normal_5ff0e83e87ab0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zizumanoxiv.epizy.com/alcohol_phenol_and_ether_ncert_solution.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b28761f-84bc-4de2-9f85-3d52ab3d8f7c/21344724807.pdfIn PDF document text
    • http://biwewija.rf.gd/92440559552.pdfIn PDF document text
    • http://nifibomagogov.rf.gd/harga_mixer_mackie_16_channel.pdfIn PDF document text
    • http://wadekazu.epizy.com/banished_colonial_charter_journey_1._71.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24645683-acfa-4061-b5eb-896a7c75d372/lovavemufepekixulava.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc552953-14e4-4ece-b024-21ab51b3d3e1/navy_prt_bike_standards_2020.pdfIn PDF document text
    • http://wenadudik.rf.gd/lokafirozunojoku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d11ba2d2-7d46-4265-9fa0-48f21daccd89/heart_touching_love_story_in_hindi_for_facebook.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_off0000fc9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9F 5224 bytes
SHA-256: d80a080af96536f1904a0da7ad427c6923d1d54f0c5ac28bbec41fbff6985b40
font_01_sfnt_off00010df0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF0 12960 bytes
SHA-256: 52ab5fe2a95c9ecae25da0680491ca3bafd785e005f49ef30c1d7eaaf4b1b95c