Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d2b527aab37c4a3…

MALICIOUS

PDF

90.0 KB Created: 2021-03-11 23:53:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5eee3f8770fbaf942f462bbd24afe8c9 SHA-1: 817d215a21c4dce31a174a29001f58636ee87dc7 SHA-256: 4d2b527aab37c4a37ba1dc35dbbf57b10bdc88c2c4470b729a3bb9701972f121
104 Risk Score

Malware Insights

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

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains an embedded URL pointing to a suspicious domain, likely intended to host or redirect to a malicious payload. The document body, though heavily obfuscated, suggests a lure related to a technical topic, combined with heuristics indicating a potential download button, reinforcing a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://xezojetit.ru/123?utm_term=heat+conduction+equation+in+spherical+coordinates+pdf
    • https://static.s123-cdn-static.com/uploads/4494677/normal_5fc901855ecd9.pdf
    • https://static.s123-cdn-static.com/uploads/4449776/normal_5fe42bd75b2f2.pdf
    • https://cdn.sqhk.co/bojodunaluko/jhWHFgc/38200938864.pdf
    • https://cdn-cms.f-static.net/uploads/4416669/normal_60398178153db.pdf
    • https://cdn-cms.f-static.net/uploads/4485587/normal_6040225ad07d9.pdf
    • https://cdn-cms.f-static.net/uploads/4458389/normal_5fd7b6194d0ca.pdf
    • https://cdn.sqhk.co/gevanadu/gc1TeNw/cross_bridge_formation_in_muscle_contraction.pdf
    • https://cdn.sqhk.co/bidelefo/umDK2ji/29346622808.pdf
    • https://static.s123-cdn-static.com/uploads/4456984/normal_5ffb39b0be20c.pdf
    • https://cdn-cms.f-static.net/uploads/4393759/normal_602932dbe3fce.pdf
    • https://static.s123-cdn-static.com/uploads/4456663/normal_5fefc5ad62f71.pdf
    • http://nalatakojuzali.iblogger.org/ups_innovations_tracking_number_format.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.opentle.org
    • https://uploads.strikinglycdn.com/files/9ef4ad4a-c7f7-4aa4-9b30-eda767ddfbc4/how_do_you_get_rid_of_back_pain_during_your_period.pdf
    • http://vopugarebino.epizy.com/24813883517.pdf
    • https://uploads.strikinglycdn.com/files/757b6b39-fd0e-4f1f-aa1c-223a22fff522/how_to_program_uniden_dect_6.0_handset.pdf
    • http://fasufigosekuwuw.rf.gd/samsung_blu_ray_player_keeps_restarting.pdf
    • http://bidilud.rf.gd/aerial_photography_and_photogrammetry.pdf
    • https://uploads.strikinglycdn.com/files/0af64436-95b0-40f9-84d1-1864cdbc4588/health_and_safety_engineer_college.pdf
    • http://devisufuxuvit.epizy.com/63344068284.pdf
    • https://uploads.strikinglycdn.com/files/3d060268-1809-4d76-a0b4-e659c987b628/47066244555.pdf
    • http://rafobubavotiba.epizy.com/cm_14_zip_file.pdf
    • https://uploads.strikinglycdn.com/files/0351c512-2aba-4156-94c5-128c48d2b546/are_logitech_receivers_universal.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
    • http://www.gnu.org/licenses/gpl.html

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104d6.bin
0fa47afae7bf52d9a771b1e98c328b0c26dab71c24dcd2250b00114253029aa4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104D6 5332 bytes
font_01_sfnt_off000116e2.bin
37169817d02946e260f61dc98285bfdfb8571dbb276661c0fe75a805d6784a9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116E2 9804 bytes
font_02_sfnt_off00013245.bin
c893b6bfa994add18ee5d3765b5e739a136191ef2f3b2ea411ea084c6985d8ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13245 12012 bytes

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