Malicious PDF — malware analysis report

Static analysis result for SHA-256 57c8f4a6c253266d…

MALICIOUS

PDF

69.2 KB Created: 2021-02-13 02:03:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 59f3ba5e8a459c23037d0ca863e2e7d7 SHA-1: 297b74267bc2662194346f11f5233472bb1c8391 SHA-256: 57c8f4a6c253266db735c093c6aff58814111e16f1b16df686804b5e2f51c64c
96 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ML classifiers and ClamAV. It contains an embedded URI pointing to 'baarspo.ru', which is likely a phishing or malware distribution domain. The document body, though heavily obfuscated, suggests a lure related to an 'Alconchoice official rebate form', indicating a phishing attempt to trick users into visiting the malicious URL. No scripts were extracted, but the presence of external URIs and the document's deceptive nature strongly suggest it's part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://baarspo.ru/wb?keyword=alconchoice%20official%20rebate%20form PDF link annotation
    • https://cdn.sqhk.co/totafeta/eCjbBH5/5122025056.pdfIn PDF document text
    • https://cdn.sqhk.co/joziroluxu/hji7ihl/among_us_mod_menu_always_imposter_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/vopofuxo/gjljdih/77767058095.pdfIn PDF document text
    • http://loxuzemifa.iblogger.org/duvobuwewojefajag.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488135/normal_5ffd3b60671de.pdfIn PDF document text
    • http://puxomisolerejog.iblogger.org/99228682897.pdfIn PDF document text
    • https://cdn.sqhk.co/jezumasulej/gchcghs/mopugakikufil.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387806/normal_5ff39b9211e66.pdfIn PDF document text
    • http://ihsteam.ru/the_little_seagull_handbook_3rd_editexccm.pdfIn PDF document text
    • https://cdn.sqhk.co/wusoxopejezo/d5jhYon/naga_ocean_king_ios.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462059/normal_5feb35f274b13.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500883/normal_6001a50a71b14.pdfIn PDF document text
    • https://cdn.sqhk.co/pumevigatare/Cijhe5k/recharge_mobicarte_bouygues_internet.pdfIn PDF document text
    • https://cdn.sqhk.co/savaketiju/jitfgiu/bulleit_bourbon_whiskey_price.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420761/normal_5fee692f37108.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476126/normal_5fcc73d9cc7b1.pdfIn PDF document text
    • https://cdn.sqhk.co/zovitamojim/shb3cHm/maps_for_mcpe_ios.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368978/normal_5fe70181d8794.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://tebalakafepikob.rf.gd/diabetes_guidelines_2019_ada.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c54b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC54B 4860 bytes
SHA-256: 5e02b3694a048094e95b8c25c8a2ca8cad63f2d266107b2d573a2c5fb4dba288
font_01_sfnt_off0000d58f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD58F 10580 bytes
SHA-256: 0475cfeb7ca8bdd249f0c3645747c470594b832e54b1bcb34b3e77ab475de76a
font_02_sfnt_off0000f996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF996 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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