Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a5b4e8a31f7c058…

MALICIOUS

PDF

84.2 KB Created: 2021-04-29 09:44:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c14bc702e7271d22127985c65b19dd3d SHA-1: 76c9cb21426acf03c0e4be159051aea5a1d8eb95 SHA-256: 0a5b4e8a31f7c0581c8ec9c8f3e56620a6ac548563ec6ff3efbd62eabb3ab236
96 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, likely intended to redirect the user to a malicious site. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the presence of external links in a PDF is a common phishing vector.

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://resalured.ru/strik?utm_term=the+scientist+beth+lyrics
    • https://pimakesoxokozo.weebly.com/uploads/1/3/4/0/134041299/881628.pdf
    • http://datiwufirul.medianewsonline.com/assam_budget_2020_download.pdf
    • https://kojivijagidisu.weebly.com/uploads/1/3/4/0/134042347/jufaxixefut.pdf
    • http://mowukedova.mypressonline.com/bjt_small_signal_analysis.pdf
    • http://tunabamilusi.mypressonline.com/english_grammar_for_dummies.pdf
    • http://lololoj.sportsontheweb.net/92790808494.pdf
    • http://lizowaw.scienceontheweb.net/supreme_student_government_constitution_and_bylaws_deped_2020.pdf
    • https://ralanuda.weebly.com/uploads/1/3/0/7/130775203/kobiwexi.pdf
    • http://pupunorip.getenjoyment.net/3d_shapes_worksheets_kindergarten.pdf
    • https://towowiwegopute.weebly.com/uploads/1/3/4/0/134019464/6123372.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://piwolimosopobu.myartsonline.com/calisthenic_workout_program.pdf
    • https://uploads.strikinglycdn.com/files/a9ddd13f-6b0c-4636-a1c2-64010a7fe0da/60627793904.pdf
    • https://uploads.strikinglycdn.com/files/33dca293-6a70-4f0e-85a8-ad1b66a66448/bright_starts_ingenuity_inlighten_avondale_2_in_1_cradling_swing.pdf
    • http://tosipasakuvil.myartsonline.com/basic_computer_science_mcqs.pdf
    • http://vovojoj.atwebpages.com/moverurerexewofebodum.pdf
    • http://gifidabula.atwebpages.com/34995323640.pdf
    • https://uploads.strikinglycdn.com/files/9d574df7-e887-4d3d-8e80-22b95318f44a/27853876705.pdf
    • https://uploads.strikinglycdn.com/files/76642b39-5488-416e-8a3c-e3bac83d540c/martin_luther_king_jrs_i_have_a_dream_speech_words.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_off00010f47.bin
86cb8fd50b8e2fcc329fcc2839dfd1644144c55bc88ff25a7155c4d40e9073ed
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F47 4868 bytes
font_01_sfnt_off00011fd9.bin
53cd74492141c26ba77c0040a94e150b14298d6407be71eb1a175f33c3e273b7
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD9 10588 bytes