Malicious PDF — malware analysis report

Static analysis result for SHA-256 88a19ca5ddbe62e1…

MALICIOUS

PDF

78.7 KB Created: 2021-03-13 20:08:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 46e2e89c7fc6410f9ab120ca2da0e35a SHA-1: e412f8c785af30237ff6b88dce15ed4233b575f5 SHA-256: 88a19ca5ddbe62e131a82ebd2ed8c10a330ce03359eb0666ff28973dabd8ee50
116 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate maliciousness. The 'SE_CALLBACK_LURE' heuristic confirms the document's intent to trick users into calling a fraudulent number, likely for a tech-support scam or financial fraud. While no scripts were explicitly extracted, the presence of embedded URLs suggests a potential for further malicious activity or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://dafemum.ru/wix?keyword=decoste+writing+protocol+validity
    • http://axecheat7.xyz/martin_luther_king_jr_speech_summaryvxumi.pdf
    • http://blancop.xyz/50413163077hoeb8.pdf
    • http://bestrongbyg.com/8811982726335sx5.pdf
    • http://kind-insta.site/traductor_ingles_espaol_google_gratis_en_linea8c4kq.pdf
    • http://doweryklkq.space/746559840798uhjw.pdf
    • http://sberin.xyz/political_science_in_nigeriabt2nw.pdf
    • http://pressit.fun/bumblebee_transformer_instructions7zf7i.pdf
    • http://grafoanaliz.ru/33827869422e26d1.pdf
    • http://paypallsecurity.com/senononor7rufn.pdf
    • http://nakrutkavk.site/376295859320wr9p.pdf
    • http://allroadkamchatka.ru/formula_del_volumen_de_prisma_cuadrangularwv7im.pdf
    • http://ionatr.fun/35848974277wyiqm.pdf
    • http://static-start.top/automation_testing_interview_questions_and_answers_for_experiencedao10k.pdf
    • http://katermore.ru/what_was_economic_imperialismaepvl.pdf
    • http://smilex.club/cedric_villani_birth_of_a_theoremw20zt.pdf
    • http://big-ita.space/bufiwamijukeodunr.pdf
    • http://hookup681.site/witer6bjvi.pdf
    • http://zathkatow.xyz/4944914985942zkj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://dijiwag.epizy.com/jixafivivanufa.pdf
    • http://riwuzapivegeb.rf.gd/addition_with_regrouping_3_digits_worksheets.pdf
    • https://uploads.strikinglycdn.com/files/5d8a6af1-1cc4-4bc9-a54d-2da361ddeebf/tesalabotutanabitisagu.pdf
    • https://uploads.strikinglycdn.com/files/3fcef1e9-6dd5-4b0c-8af7-dceab1584ab0/53786400111.pdf
    • http://wudobew.epizy.com/busybox_pro_apk_cracked_free.pdf
    • https://uploads.strikinglycdn.com/files/f0bd0c84-6ffd-48ee-8af2-4e4388c78673/friedberg_insel_spence_linear_algebra_4th_ed.pdf
    • http://boxogegifenefi.epizy.com/bovine_spongiform_encephalopathy_bse_symptoms.pdf
    • https://uploads.strikinglycdn.com/files/80877639-98bb-4c6e-8966-4065f3bd646d/93440417316.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_off0000f625.bin
7a60552199bb925c28267e269a058e2daca34da3ccc6a42c7dcba263200397c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF625 5492 bytes
font_01_sfnt_off00010907.bin
37f8a3d34ce859367224bd94400171b7a07ce839ff4b721dd21134fa35a28444		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10907 10620 bytes

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