Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd712fc82c18fa24…

MALICIOUS

PDF

78.0 KB Created: 2021-04-03 20:20:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 67bd516655d2d82d90019d241450f2d7 SHA-1: ceed4f17a2de9450edbf83545167ad8037de8978 SHA-256: bd712fc82c18fa244181bfcb25f73efbe55fa7cd1fbd01f11844985a03f7df9c
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and flagged as potentially malicious. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, appears to be a lure related to a search query, directing users to a suspicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=what+is+the+value+of+the+bond+angles+in+coh2 PDF link annotation
    • http://urott-hu.com/goresuzakiwibugf7220.pdfIn PDF document text
    • http://uscarinsurance.info/99125749986rggou.pdfIn PDF document text
    • http://bujufamamaw.22web.org/pinch_of_nom_recipes.pdfIn PDF document text
    • https://cdn.sqhk.co/sebidurubuze/hCjb80N/mukevoxutonategiroso.pdfIn PDF document text
    • https://cdn.sqhk.co/daxerarugak/PeAjgie/doom_patrol_dorothy_powers.pdfIn PDF document text
    • http://sodaapp.club/how_to_solve_complementary_angles_in_trigonometryvr2w2.pdfIn PDF document text
    • https://cdn.sqhk.co/sifajoxojif/jDig5kI/50631231326.pdfIn PDF document text
    • http://iuts.space/48251890652fz1o2.pdfIn PDF document text
    • https://cdn.sqhk.co/nedovipirumu/Sjfhfhj/guidecraft_kitchen_helper_keeper.pdfIn PDF document text
    • https://cdn.sqhk.co/jazumagefo/ELjiQgd/bangla_funny_natok.pdfIn PDF document text
    • http://formblckr1.xyz/noxobanomzsu5a.pdfIn PDF document text
    • http://leopards.space/neet_paper_2019_answer_sheetpb008.pdfIn PDF document text
    • http://study-english-04.space/75411535099bz95y.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
    • https://28481333-1ef2-46fb-8ebf-d56c3f24acbc.filesusr.com/ugd/314c35_a3a99eff602a4e018a9b464c23580c0c.pdf?index=trueIn PDF document text
    • http://menepukezovexo.epizy.com/contemporary_approaches_to_marketing.pdfIn PDF document text
    • http://lixaxezubor.rf.gd/70295166828.pdfIn PDF document text
    • http://legujajojozete.epizy.com/dogozapulifomulilu.pdfIn PDF document text
    • http://gusabonatixuk.rf.gd/fufutolezizekofuru.pdfIn PDF document text
    • http://filopatoj.rf.gd/splash_screen_with_animation_in_android_studio.pdfIn PDF document text
    • http://wamovesomawegun.rf.gd/jesus_bleibet_meine_freude_chor_noten.pdfIn PDF document text
    • https://55f5e71c-5f54-469f-9449-301c43944234.filesusr.com/ugd/bbdb65_f984cc5e2bbe4e97b7e8957d7bc37f7d.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE068 5416 bytes
SHA-256: a193a8b0a153b8e5ee5b1ad7ce978ed9c15502795a51f85d7dc1a23e022cacf5
font_01_sfnt_off0000f2df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DF 11780 bytes
SHA-256: c55293fc8929eddac644a33a9d1bee2ad257fb8a05fadf71a4790bcfc519b7e1
font_02_sfnt_off00011a6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A6A 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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