Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd99fba43b4e1962…

MALICIOUS

PDF

82.4 KB Created: 2021-02-12 09:24:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: d2e16f1b88274e6a1e623175805d6a4f SHA-1: 49f1b806dc3108f4f437fe10cd300f76c760b07d SHA-256: dd99fba43b4e1962635a257bccd52612ab030d4bbf9ea6eac33ea65537a51b82
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. These links point to various domains, many of which appear to be disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing malware. While no scripts were explicitly extracted, the nature of the link farm suggests an attempt to redirect users to malicious sites or to manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/wix?keyword=2012+mustang+v6+specs PDF link annotation
    • http://support-copyrighthelpservice-about.com/oxford_placement_test_listening_answersogrxa.pdfIn PDF document text
    • http://selowopax.22web.org/raros.pdfIn PDF document text
    • https://xulewanexu.weebly.com/uploads/1/3/4/1/134108589/bisuv.pdfIn PDF document text
    • http://copyrightsupport-ig.com/nasaje9c8e.pdfIn PDF document text
    • https://cdn.sqhk.co/sovokeduseb/8jfgcnr/psx4droid_bios_bin.pdfIn PDF document text
    • http://bokubewere.22web.org/mizapivi.pdfIn PDF document text
    • https://cdn.sqhk.co/roxigeve/B4iihPQ/road_trip_planner_national_parks.pdfIn PDF document text
    • http://healthyforczechrepublic.site/sambalpuri_mantu_churia_audio_songkcvye.pdfIn PDF document text
    • https://cdn.sqhk.co/kusewupudin/J7aiiKB/parkour_meme_image.pdfIn PDF document text
    • https://wetexojozow.weebly.com/uploads/1/3/0/7/130740218/bowibalebenuruj.pdfIn PDF document text
    • http://dompodklyuch.com/cover_letter_template_for_studentsh9fqf.pdfIn PDF document text
    • https://cdn.sqhk.co/rorazelesu/WienheE/running_fred_1._8._0_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/pumopivosoba/hfjcijx/pac_man_ghost_dog_costume.pdfIn PDF document text
    • https://cdn.sqhk.co/perikowep/ahChbHk/zibasinefaxasobulegu.pdfIn PDF document text
    • https://cdn.sqhk.co/zatufora/gcjjDeF/large_button_cordless_phone_for_seniors.pdfIn PDF document text
    • https://cdn.sqhk.co/fumediju/YYeENh1/monster_hunter_world_iceborne_master_edition_g2a.pdfIn PDF document text
    • https://jawonuvanez.weebly.com/uploads/1/3/6/0/136021807/e54dd31b61.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kujafugakare.epizy.com/todipekegarub.pdfIn PDF document text
    • http://buwijakuwomem.rf.gd/61576350802.pdfIn PDF document text
    • http://wamowif.rf.gd/sowekaruzowuvulik.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_off0000f9ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EC 5572 bytes
SHA-256: 4f42653b08ec3df448882732da58bd3d9f49d2dfa180c5f1fb69ff22e6fd6266
font_01_sfnt_off00010cde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDE 15040 bytes
SHA-256: 8fa7e0e9e29240713b8156c50cd2ef4080f17900b54da4bedd9d96fd588f7a62

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