Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1fa4b669edfda28…

MALICIOUS

PDF

84.0 KB Created: 2021-04-25 02:21:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dfd0bc31193677c8ad035f62c76fd2ef SHA-1: 54382c48d27cb62ed62b41fdebb197b40e963119 SHA-256: c1fa4b669edfda280aef0a5d9b43d1596b0245a63e7e48ce0b6dcc1efedeabfe
116 Risk Score

Malware Insights

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

The file was detected as a phishing trojan by ClamAV and flagged by an ML classifier. The 'SE_CALLBACK_LURE' heuristic indicates the document is designed to trick users into calling a phone number, a common tactic in tech-support scams and callback phishing. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it may leverage JavaScript for malicious actions, such as redirecting to phishing sites or downloading further payloads.

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
  • 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://seumenha.ru/strik?utm_term=how+to+assemble+weber+spirit+e+210
    • https://lopuvekire.weebly.com/uploads/1/3/0/8/130813144/4860635.pdf
    • https://cdn.sqhk.co/fogizotufijo/MjjhibM/aspial_corporation_annual_report_2017.pdf
    • http://wide-mean.top/gikezobojavd5jr.pdf
    • https://cdn.sqhk.co/golemejexeno/wlIicic/81806535521.pdf
    • http://stepka2016.xyz/how_to_pass_the_written_driving_test_in_arizona7mrev.pdf
    • http://habercigo.com/childrens_natural_wood_table_and_chairsunl7h.pdf
    • https://resevaguwitim.weebly.com/uploads/1/3/5/2/135298688/8885691.pdf
    • https://zusikazokek.weebly.com/uploads/1/3/1/4/131453156/zupapuzi.pdf
    • http://topdouche.xyz/how_to_run_clean_cycle_on_frigidaire_affinity_washer36wiv.pdf
    • http://milanbeach.fun/jixotutusk8b9.pdf
    • http://mrt-zdes.ru/junujixubotekarilw2inw.pdf
    • https://kijemaroxajum.weebly.com/uploads/1/3/5/3/135397629/4926153.pdf
    • https://poxagubojawi.weebly.com/uploads/1/3/1/4/131482812/mosujejefe-weturaloz.pdf
    • https://pinozawekik.weebly.com/uploads/1/3/4/5/134589254/fb90a8.pdf
    • https://ranitezal.weebly.com/uploads/1/3/1/4/131438109/mukavisuviludipepu.pdf
    • http://drive4mclanemilwaukee.com/juzizegeritajm7zky.pdf
    • http://azorocheat6.xyz/mahalakshmi_calendar_august_202000zsc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/426f15af-d5fb-4112-b863-346029e06d1f/46935815168.pdf
    • https://uploads.strikinglycdn.com/files/2ae05c2c-c23b-42f0-bc07-9b276e22be21/crear_hoja_de_vida_sigep.pdf
    • https://uploads.strikinglycdn.com/files/6ec72a0a-359a-4cbf-899a-44b9aaafca1a/53594033459.pdf
    • https://uploads.strikinglycdn.com/files/f531ae19-10be-42d7-8288-bea74b219352/role_of_medical_social_worker_slideshare.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbe0.bin
c67c7c2d1cec3dbcaad1ddc8e90f8c4fd207c92228028674df5d39b98982b641		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE0 5168 bytes
font_01_sfnt_off00010d7a.bin
b4b3afb6135bf2cade413cd5329575a56a0aecdd93f56561a866b2e15f744c93		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7A 11840 bytes
font_02_sfnt_off00013547.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13547 4324 bytes

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