Malicious PDF — malware analysis report

Static analysis result for SHA-256 3944cd784db2fd05…

MALICIOUS

PDF

89.7 KB Created: 2021-03-09 21:32:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 14b8fbcdfcb06888a811141ceb15f8f5 SHA-1: b837252903695071ff5719d0124d38908b3a2193 SHA-256: 3944cd784db2fd0503350e1c08fd988a132963f47215d3cf719b6ff858bf3c3c
116 Risk Score

Malware Insights

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

The file is identified as malicious by multiple heuristics and a machine learning classifier. The 'SE_CALLBACK_LURE' heuristic indicates the document is designed to trick users into calling a phone number, a common tactic in phishing and tech-support scams. While no scripts were explicitly extracted, the PDF format can embed JavaScript, and the presence of external URLs suggests a potential for further malicious activity or redirection. The primary attack vector is likely spearphishing attachment, leading to a callback scam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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
  • 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://golowaki.ru/award?keyword=centriolos+celula+animal+pdf
    • http://canonsburglake.com/princeton_review_sat_book_20200nzq2.pdf
    • http://govuxojikasumot.scienceontheweb.net/57780403338.pdf
    • https://cdn-cms.f-static.net/uploads/4481831/normal_6041adc2c9014.pdf
    • http://gipokaxu.22web.org/lixaremadulejopekagigi.pdf
    • http://ch-bewertung-2888.xyz/play_tamil_hd_movie_freeyvsmu.pdf
    • http://circulyarkadigital.xyz/shadow_and_bone_book_seriesrkyx4.pdf
    • http://mirunex.iblogger.org/lazijabuvisuzedanevu.pdf
    • http://tefitagesev.mypressonline.com/jalowiremus.pdf
    • http://boost-shop.xyz/kevufuregakwzs.pdf
    • http://tvoyoproc.fun/mutesunubt87j5.pdf
    • https://cdn-cms.f-static.net/uploads/4408993/normal_600b2502cfef0.pdf
    • http://zimezobot.getenjoyment.net/madabedababarorobun.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://joriboka.epizy.com/foundations_digital_answers_debt.pdf
    • http://xamopogowidori.rf.gd/what_is_the_difference_between_the_flip_4_and_flip_5.pdf
    • http://fowafad.epizy.com/4357312979.pdf
    • https://s3.amazonaws.com/napejaxosinages/bal_ganesh_information_in_english.pdf
    • http://kesopepi.rf.gd/20454326761.pdf
    • http://rawelusovonifax.epizy.com/xibog.pdf
    • https://s3.amazonaws.com/sesafefanulokam/26945857432.pdf
    • http://batevawave.epizy.com/lovuzomifarabo.pdf
    • http://zemadepa.rf.gd/how_much_swim_training_for_half_ironman.pdf
    • http://lenegimuni.epizy.com/12168918035.pdf
    • https://s3.amazonaws.com/poguvelefa/33752137687.pdf
    • https://s3.amazonaws.com/lorifumofelu/download_film_divergent_2_subtitle_indonesia.pdf
    • https://s3.amazonaws.com/xakapudakadu/employee_performance_evaluation_templates_free.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_off000115a9.bin
cee2c705bdbe13c51bc1fca042e9de1d4e24c84cde205c5c8df80677c4bbb526		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115A9 5208 bytes
font_01_sfnt_off00012742.bin
661181a3ed134efbcc4c94e8bd2f830e88b0518278181df9f027221f0e6de686		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12742 10472 bytes
font_02_sfnt_off00014b27.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14B27 4324 bytes

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