Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffd9cafc0dc7c8b5…

MALICIOUS

PDF

96.7 KB Created: 2021-03-31 17:10:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b7df1ec0b1b9e2e3f9b9020556122a7b SHA-1: 761ec742539d74608cfe74d207516cc3f24b617a SHA-256: ffd9cafc0dc7c8b5e9c9f83b61f92beab18f29befdae167332f195f914fc4f87
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with a high risk score. It contains an embedded URL pointing to a suspicious domain, which is likely used to deliver a malicious payload. The document body, though truncated, suggests a lure related to educational worksheets, consistent with phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://mezovuduw.ru/wix?keyword=shifts+in+demand+curve+worksheet+answers
    • http://thepropheticapp.com/acronis_workstation_12._5it8w8.pdf
    • http://setofexperience.site/cursive_handwriting_sheets_ks1_freeqcgw2.pdf
    • http://vavolezabogisop.iblogger.org/do_any_new_washing_machines_have_lint_filters.pdf
    • http://covidcapsule.world/74475154317m0sv3.pdf
    • http://xtreme-sport.ru/jersey_mikes_turkey_sub_caloriesp01o7.pdf
    • https://warevinigipa.weebly.com/uploads/1/3/4/8/134898994/bagudo.pdf
    • https://tiforunu.weebly.com/uploads/1/3/1/4/131437018/xegesinozoxarojidewu.pdf
    • https://jerolukemotib.weebly.com/uploads/1/3/0/8/130874115/833f9ade.pdf
    • http://triple-doska3.club/p-_touch_address_book_software7hi2b.pdf
    • http://boomerangoo.site/pevojuxigufivosozeruz05xmi.pdf
    • http://creditscorehelp.info/viking_refrigerator_water_filter_bypassymxhv.pdf
    • https://retorize.weebly.com/uploads/1/3/0/9/130969817/4315566.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/bb091c2c-7c08-408c-9023-2847ee1643ff/base_rate_neglect_defined.pdf
    • https://07e0a16e-b77d-475b-b724-88bbaedb347c.filesusr.com/ugd/8e9e2f_08dc8bcc145540ecb134151aa294ab15.pdf?index=true
    • http://walazej.rf.gd/loxijevanarujikitapuga.pdf
    • http://poxemibusap.epizy.com/83783566481.pdf
    • https://uploads.strikinglycdn.com/files/83a1ab27-c653-4589-9d47-55eb85de43ce/nitro_pro_10_convert_to_word.pdf
    • https://c3d762b3-5d50-4891-ab6d-43710edd2423.filesusr.com/ugd/3254bf_7636b8ee4c9e4108ad9b1248fb0aff83.pdf?index=true
    • http://zigerakujig.rf.gd/vajetisubogow.pdf
    • https://uploads.strikinglycdn.com/files/707f4462-fc07-4079-a071-2af72798e4b9/84439145821.pdf
    • https://58f604bd-1fd8-4cfe-af9b-f15e67d030d5.filesusr.com/ugd/9a7439_9606b7ad01ca44ae86198edd56baa39e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c688551d-911b-40ce-b553-ccfbabcd2bec/86267611764.pdf
    • https://uploads.strikinglycdn.com/files/2f1d8bb1-a5bb-4eb6-9668-4be04b0ab566/calligraphy_practice_workbook.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_off00013c7a.bin
18c67dcaf35c85ed4097d2ea3906ed60d34c827de920ed91be31e7b56b5c573e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13C7A 5548 bytes
font_01_sfnt_off00014f42.bin
386a922cdd8c250452006d4491e815144d688c963d52dbe87a9a6d8c16c96584		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14F42 11200 bytes

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