Malicious PDF — malware analysis report

Static analysis result for SHA-256 438bf8d1855779fe…

MALICIOUS

PDF

64.0 KB Created: 2021-02-23 03:36:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 349294cbafe91c31d013650dff7fa8f1 SHA-1: f7d6cd63009fb8751e7dffaac617fa9e4a702158 SHA-256: 438bf8d1855779fec2ee96a589bf8bdfed60fe6e52c048e4733860e8e6b34cfb
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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=pokemon+off+white+apk+download PDF link annotation
    • http://adyga.site/75649944338bj4d6.pdfIn PDF document text
    • http://sodalabs.pro/24114146521ajnzd.pdfIn PDF document text
    • http://xagelofitu.22web.org/2017_tamil_album_remix_songs.pdfIn PDF document text
    • http://blekrossi.ru/beach_head_2_game_freek72q1.pdfIn PDF document text
    • http://workmonster.net/vazejitodanuvezumabasa31gj.pdfIn PDF document text
    • https://cdn.sqhk.co/xarozowuzosa/1ghhVhd/21479763130.pdfIn PDF document text
    • http://twirlini.com/atlantis_terraform_workspacezxk4a.pdfIn PDF document text
    • https://cdn.sqhk.co/vavuvalegel/V1Jmg6n/50392103525.pdfIn PDF document text
    • http://creditscoretracking.info/penatalaksanaan_carpal_tunnel_syndromeddvqt.pdfIn PDF document text
    • http://fartook.online/how_to_gain_followers_on_instagram_without_hashtagsj5whj.pdfIn PDF document text
    • https://cdn.sqhk.co/rurokusulos/Hf6jfhj/hydraulic_calculations_sprinkler.pdfIn PDF document text
    • http://dasuwupozu.22web.org/63753595982.pdfIn PDF document text
    • http://timurberg.ru/a_dance_with_dragonso05go.pdfIn PDF document text
    • https://togimapobeno.weebly.com/uploads/1/3/4/6/134649298/ginekotidevirojap.pdfIn PDF document text
    • https://cdn.sqhk.co/mujawiru/h4Lkjc0/gamer_wallpaper_for_bedroom.pdfIn PDF document text
    • https://nasuvanebi.weebly.com/uploads/1/3/5/3/135393195/3397524.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pavemadimakok.epizy.com/scag_tiger_cub_service_manual.pdfIn PDF document text
    • http://kukuvil.epizy.com/tmux_mac_cheat_sheet.pdfIn PDF document text
    • http://xonifovozub.epizy.com/benufuvojategexujo.pdfIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/jbl_flip_3_bluetooth_speaker_watts.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_off0000bfd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFD1 5164 bytes
SHA-256: 3e8898c2dbc6b10e3b29f5acf9200da842b0dc95b06dc084627e0c851f2060fe
font_01_sfnt_off0000d158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD158 9756 bytes
SHA-256: 2966ec94b73850e0352330d9de45c78f691bc208fbaf4c1007ec57016dfcb2fa

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