Malicious PDF — malware analysis report

Static analysis result for SHA-256 15a5a58cf2af1d8b…

MALICIOUS

PDF

75.4 KB Created: 2021-03-11 04:47:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 1d683775c0b6d3d97219449f635b8cb9 SHA-1: fd2d747a6991525879cab74d4bf0fc0db48c7772 SHA-256: 15a5a58cf2af1d8b4ac6dbeb49ea3132ce55088373a85fafacf08a3a1968be1d
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. It contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains references to 'aptoide tv apk installer', indicating a lure for software downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://maypoin.ru/wix?keyword=aptoide+tv+apk+installer PDF link annotation
    • https://cdn.sqhk.co/lotivadafe/hh7PjaD/97059609906.pdfIn PDF document text
    • http://shtangennstutkupitseychas.xyz/tanusedelebusonuduicis1.pdfIn PDF document text
    • http://raicen.com/platform_toolset_v120_not_foundrpsvq.pdfIn PDF document text
    • http://datingdate.site/the_game_pickup_artist8rvut.pdfIn PDF document text
    • http://blog-millionaire.buzz/276375541351smei.pdfIn PDF document text
    • http://laxeded.iblogger.org/pebovoxalaxe.pdfIn PDF document text
    • http://vadirikolofifi.iblogger.org/perform_quantitative_risk_analysis_pmp.pdfIn PDF document text
    • http://bosnoslovnoejelaniekupit.xyz/tuxabugov36iuu.pdfIn PDF document text
    • http://neguzoni.22web.org/66898384258.pdfIn PDF document text
    • https://cdn.sqhk.co/kixobaza/hZieX6E/nigivozixanixugitiba.pdfIn PDF document text
    • https://cdn.sqhk.co/pajelidul/b2ivXYc/bixugafomazepuzaroxasa.pdfIn PDF document text
    • http://vizujoguva.iblogger.org/avent_microwave_steam_sterilizer_directions.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475379/normal_604174dc20954.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450345/normal_5fec300b1315d.pdfIn PDF document text
    • https://cdn.sqhk.co/zidexamuwela/OF1Shi7/goddess_kiss_pilot_select_box.pdfIn PDF document text
    • http://zdorovie-vashe-vse.xyz/high_school_dance_team_captain_responsibilities0hk2k.pdfIn PDF document text
    • http://blockhcain.host/hallelujah_sheet_music_piano_and_vocbt3ci.pdfIn PDF document text
    • http://jogubewuzamofet.iblogger.org/51664498009.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375207/normal_5fe0b3ef940d9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pifujisebakiju.epizy.com/budepafasuxowulo.pdfIn PDF document text
    • http://fufimawosudine.epizy.com/how_much_money_does_a_storyboard_artist_make.pdfIn PDF document text
    • http://tejusadesivuti.epizy.com/jupoditojideserugixakoju.pdfIn PDF document text
    • http://vasedazixi.rf.gd/dryer_sheets_smelly_shoes.pdfIn PDF document text
    • http://razebegapusej.rf.gd/html_text_tags_examples.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_off0000ec34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC34 5068 bytes
SHA-256: 5c20a0ad35a5ba960603a230f1a01440715841591608824defbdd569b047a6dd
font_01_sfnt_off0000fd8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8A 10184 bytes
SHA-256: d5ecfb4c5ac1fa7bdd946523f131c27cf6bc4925b85bbaf3974fcca021482207

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