Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe87279f847929e8…

MALICIOUS

PDF

147.0 KB Created: 2021-02-11 03:55:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 43235e87f6e85e4795391be66a0581af SHA-1: f86f09c0b83b971636561974e5a6f898e94ee616 SHA-256: fe87279f847929e86ad037a930918eaaf02e36f25f57ef98c65860afd938421c
126 Risk Score

Malware Insights

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

The PDF file contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains references to 'Roblox song id', suggesting a lure to attract users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://seumenha.ru/123?utm_term=roblox+song+id PDF link annotation
    • https://notaxivarem.weebly.com/uploads/1/3/4/6/134633458/jadiwal_metemip_xufifezabaw.pdfIn PDF document text
    • http://bandalet.club/anime_face_maker_websiteexvfj.pdfIn PDF document text
    • http://kulokozataxat.22web.org/86842572274.pdfIn PDF document text
    • https://cdn.sqhk.co/zidodovare/BgiNjaX/saguvoripibolumotiwiwuf.pdfIn PDF document text
    • http://pumba.fun/rocketman_full_song_listne0c2.pdfIn PDF document text
    • http://zuluwana.iblogger.org/down_syndrome_thyroid_screening_guidelines.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369502/normal_601b7c6ce7e62.pdfIn PDF document text
    • http://thelandofbadideas.com/common_application_form_2020f0dim.pdfIn PDF document text
    • https://cdn.sqhk.co/bidusowo/idjbge5/toxivob.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408186/normal_5ff70b041df28.pdfIn PDF document text
    • http://wubegewefek.iblogger.org/kojere.pdfIn PDF document text
    • https://cdn.sqhk.co/kepilujofeje/fXXihiJ/37663974575.pdfIn PDF document text
    • https://cdn.sqhk.co/gusisitixinu/ig7ibjb/share_chat_punjabi_funny_video_tik_tok.pdfIn PDF document text
    • https://cdn.sqhk.co/kofosenolo/hgM0tgh/make_a_face_mask_at_home_no_sewing.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://pevurevakube.rf.gd/designation_letter_format_in_word.pdfIn PDF document text
    • https://s3.amazonaws.com/vixuwogetiv/17111739698.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001e352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E352 3200 bytes
SHA-256: a10458568313899c1307c4fb4a7ec9693dc1a81f0bf58184c24fdd267e2c7dfb
font_01_sfnt_off0001eed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EED3 4492 bytes
SHA-256: 160593ec522aad0c9c0025c5ced24478d922cb285801b7e3787516bc095296a9
font_02_sfnt_off0001fe10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FE10 16336 bytes
SHA-256: e001b1ff3ac215a3f983fecef78fe478fca419cef46212d9d7887c8ab92e4384
font_03_sfnt_off00023019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23019 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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