Malicious PDF — malware analysis report

Static analysis result for SHA-256 b530971c9d31956a…

MALICIOUS

PDF

73.3 KB Created: 2021-03-10 23:41:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15e880e00ce7caf326ec367f7b61f5d5 SHA-1: 20d3923fc6ac956fd4e9c35ead4f568b5126b080 SHA-256: b530971c9d31956a374f0978e47a287e7b53727a71528b47b32fb1f394f65b30
116 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by a machine learning classifier and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. The document body and heuristics suggest a callback phishing lure related to 'Buncombe county warrants', aiming to trick the user into calling a provided phone number. While no scripts were explicitly extracted, the presence of external URIs and the overall detection suggest it may leverage embedded JavaScript or other exploits to facilitate the phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://druttle.ru/wix?keyword=buncombe+county+warrants
    • https://cdn.sqhk.co/papowepu/SMgcnNb/70861243799.pdf
    • https://cdn.sqhk.co/zejizoguzut/hhFjfBj/autodesk_character_generator_review.pdf
    • http://shtangelkipokupkiitd.online/consumer_reports_used_car_guide_201806666.pdf
    • https://cdn.sqhk.co/xeloxilava/y9rCjaw/ropuvewiriguwowije.pdf
    • https://static.s123-cdn-static.com/uploads/4454040/normal_5fe517f68c33a.pdf
    • https://cdn.sqhk.co/tiwumixe/6h9kCjf/modern_warfare_cruise_missile_boost.pdf
    • https://cdn-cms.f-static.net/uploads/4443819/normal_601101a2473fc.pdf
    • https://cdn.sqhk.co/vefomatakin/hgUyjbJ/tmnt_rooftop_run_download.pdf
    • https://cdn.sqhk.co/botonerepap/igWi2gg/19509059338.pdf
    • https://cdn.sqhk.co/kululojilo/cjhgg4p/words_with_b_r_i_d_e_l.pdf
    • https://cdn.sqhk.co/wevexifimur/gc56Zvs/metal_boyama_kalemleri.pdf
    • https://cdn.sqhk.co/tobijoge/UyWhSha/21985782834.pdf
    • http://zememor.sportsontheweb.net/94344822652.pdf
    • http://dronextactical.xyz/roman_numerals_worksheet_1-1000qhy97.pdf
    • https://cdn.sqhk.co/tevimuwijile/geQHhgA/classic_arcade_nes_emulator.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zepizevut.atwebpages.com/purple_is_my_favorite_color_meme.pdf
    • http://bitujiduruv.myartsonline.com/crown_princess_cruises_deck_plans.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e195.bin
66fdd534a63b89336460fa8a9af5b6cbaaf580d5a2f9176bc46c340becabdd3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE195 5296 bytes
font_01_sfnt_off0000f397.bin
f6f29eb057179384b4549f341f83ed091ee1c5c0dc303212e55a0690d259692a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF397 10756 bytes

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