Malicious PDF — malware analysis report

Static analysis result for SHA-256 7898e628da42ca7b…

MALICIOUS

PDF

83.8 KB Created: 2021-03-22 08:45:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 248f73064b0615b306fb57b8c238e688 SHA-1: 7bedbfd43503bb50cba5fdb248c03a54acd53274 SHA-256: 7898e628da42ca7b74513bb0ee8ff0fcdac072e4ee22ae1f5776d773fe77eb1b
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, including a link farm heuristic firing, suggesting an attempt to redirect users to malicious sites. The ClamAV detection and ML classifier indicate malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to lead users to compromised or malicious web content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://ponafet.ru/123?utm_term=introduction+to+c+programming+pdf
    • http://xewitanajudozu.iblogger.org/muxadirinidagolutobujela.pdf
    • http://dojixosop.iblogger.org/12141525523.pdf
    • http://vawurabel.mygamesonline.org/android_based_attendance_system.pdf
    • http://likedizar.medianewsonline.com/national_award_winners_2020.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/f9f27b66-efdb-428c-89be-389c97813530/gidovanutuligugosoxa.pdf
    • https://uploads.strikinglycdn.com/files/72b9d9ce-43b7-4b8d-87cf-1e1059ed9c38/momupobagatigatiruwosuse.pdf
    • https://uploads.strikinglycdn.com/files/d95e1bf4-17ff-436c-86de-87824dba34f8/tagegisalidi.pdf
    • https://uploads.strikinglycdn.com/files/40e28068-7d59-4028-9938-98ab8e51fde9/how_to_drive_a_eaton_fuller_8_speed.pdf
    • https://efa91360-7c21-416c-9d60-3189e0beb381.filesusr.com/ugd/42ffc7_3f9b9cf739214f40bbdb98270c30038e.pdf?index=true
    • http://lusajafimaneru.myartsonline.com/antenna_theory_analysis_and_design_balanis_download.pdf
    • https://uploads.strikinglycdn.com/files/dfe57ba0-eb1d-4d26-9168-7462690b1932/which_of_the_following_is_not_an_example_of_a_nonfiction_text.pdf
    • https://uploads.strikinglycdn.com/files/700b0124-1388-4be4-ad8d-6adb413644d7/doketedomusuvizefosore.pdf
    • http://suwuriru.onlinewebshop.net/54815938405.pdf
    • https://uploads.strikinglycdn.com/files/e1ad56ff-1b30-44e8-864b-56547f50c313/10341705007.pdf
    • https://uploads.strikinglycdn.com/files/fe6c9360-2c23-4360-a79b-995e7de71d79/93891751484.pdf
    • http://wutejaxevewef.myartsonline.com/how_do_you_report_levenes_test.pdf
    • http://zaxutakizet.epizy.com/pdf_to_dwg_converter_download_online.pdf
    • https://ca7c05ed-d233-4774-9cf9-08ff86aa6c73.filesusr.com/ugd/b42fd6_1b5b7fe933064a289d22e80710cf1264.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7b09afb9-d7ba-43e9-a97f-c52537603a00/51725730515.pdf
    • https://4a39c6c9-989b-4d11-b2d8-cc0becc7f193.filesusr.com/ugd/ef0078_f6e6e3cd03c94cb7a10b79705309a865.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9c30f205-af13-415c-bac7-79b91ea93d8c/91617881196.pdf
    • https://uploads.strikinglycdn.com/files/514b9fc5-9c81-4f7c-99fc-fb15ad976955/harga_baterai_netbook_acer_aspire_one_722.pdf
    • https://uploads.strikinglycdn.com/files/152ae35f-eaa3-4460-9aef-7dbd38759b83/what_is_a_sentence_for_daybed.pdf
    • https://07d68bf2-0661-47e2-9ffe-eae068a071af.filesusr.com/ugd/fef806_83e9da3aa737468faafd0e10eb5267a7.pdf?index=true
    • https://fb7bf4c5-056f-4058-a7d1-073478569b53.filesusr.com/ugd/d90490_94010f44f8aa42c3be17f833f76dabab.pdf?index=true
    • http://sixipuliximedi.epizy.com/coliformes_fecais_no_banheiro.pdf
    • https://uploads.strikinglycdn.com/files/5160bd78-5aa3-4e94-a327-4b25d7f6965b/7444279698.pdf
    • https://uploads.strikinglycdn.com/files/09b73442-f913-4e63-a549-3d4d39e096dc/tomtom_one_n14644_preis.pdf
    • https://uploads.strikinglycdn.com/files/ccc221b2-a45c-403e-91f3-1052c3ca9af4/7613219129.pdf
    • http://jofikajanuxepu.epizy.com/microsoft_wireless_mouse_5000_linux_driver.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_off0000fae8.bin
5c23133534f0ad317dbd914203c19dfb4e455a124de9b16719a163ddcbcaaf46
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE8 4968 bytes
font_01_sfnt_off00010bb0.bin
c923f5b1bb0870094d113e6720ae3b861da05c0846a564f314cd684a9dd963a9
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB0 11476 bytes
font_02_sfnt_off000132e8.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x132E8 4324 bytes