Malicious PDF — malware analysis report

Static analysis result for SHA-256 268c8c971c4c1dcd…

MALICIOUS

PDF

119.9 KB Created: 2021-06-09 08:42:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 6268e5c3b8c627b00923d41c9459e710 SHA-1: ef457a17f6826ca375ad6d19a01cb0d35d668a66 SHA-256: 268c8c971c4c1dcdd8ea31b590a49d86948266ed0d1160fb839e5f90728621c8
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://archism.ru/pbw?utm_term=motivational+books+in+english+free+download+pdf PDF link annotation
    • https://gamalisixidu.weebly.com/uploads/1/3/5/9/135958628/b9dd5.pdfIn PDF document text
    • https://sazigusejif.weebly.com/uploads/1/3/4/7/134771803/zebux_kovewifojujulir_nepiliwezona_fujijosulimewi.pdfIn PDF document text
    • https://bavopasivivewid.weebly.com/uploads/1/3/0/7/130738836/jejokixetuzek.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b013329-b559-4761-bad6-eafb7cca3147/how_to_share_blogger_post_on_facebook_page_automatically.pdfIn PDF document text
    • http://garewewaziwu.pbworks.com/w/file/fetch/144578583/how_to_use_the_6th_and_7th_books_of_moses.pdfIn PDF document text
    • http://pikalunik.pbworks.com/w/file/fetch/144781311/ledasonogozimugosekobiki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aab8158f-1264-4066-803d-8814d97154e9/62594347964.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50986e77-f861-4025-88d8-3c9070a1f636/clash_of_clans_para_hileli_apk_indir_android_oyun_club.pdfIn PDF document text
    • http://natofuke.pbworks.com/w/file/fetch/144835944/earthquake_definition_causes_and_effects.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04d5bedb-2121-4b8d-933a-18f16df0e588/sigulanogedavujewajulegi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c9987a6-b8b3-4d74-8796-96e2f438bb8d/48661512450.pdfIn PDF document text
    • http://gutopevif.pbworks.com/w/file/fetch/144880155/21799010276.pdfIn PDF document text
    • http://waxijoruv.pbworks.com/f/nidivaru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba725739-75e7-4243-8a59-6bdb1f1a736f/79558380850.pdfIn PDF document text
    • http://pobonagul.pbworks.com/f/ejercicios_de_formacion_de_palabras_resueltos.pdfIn PDF document text
    • http://kejuziz.pbworks.com/f/fixegozibug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd3d0a4e-72c9-4144-9c64-4b77629b4190/how_to_transfer_big_files_from_pc_to_pc.pdfIn PDF document text
    • http://nuxawakaxaz.pbworks.com/f/27660825220.pdfIn PDF document text
    • http://jilawuxifi.pbworks.com/f/how_to_audition_for_the_percy_jackson_show.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87a68f96-04af-4025-b5f4-9f15aee7d847/kirby_heritage_vacuum_bags.pdfIn PDF document text
    • http://xemeganavon.pbworks.com/f/41660267911.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f28a9b99-51f9-4ab7-bae1-a8fd62038bdd/ballade_pour_adeline_easy_piano_sheet_music_free.pdfIn PDF document text
    • http://fufitan.pbworks.com/f/wwe_2k17_apk_file_download_for_android.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off000199ba.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x199BA 18968 bytes
SHA-256: a95434d15698f00defd39cb814c2392ba25b7e271b61895328f7629083984921
font_00_sfnt_off00015657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15657 5664 bytes
SHA-256: 6f2165ff18365bcbfbb0b91379a32aa2bd50e03e33a954cda32ea67c9dd55d01
font_01_sfnt_off000169b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169B4 3720 bytes
SHA-256: d0c9e33916e9e64e42e31bcf0d345f6c2fcd41735b1a34df0119bd0eb1094281
font_02_sfnt_off00017518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17518 10688 bytes
SHA-256: 10818b58f46adfbedf22c437952621e214b55abe5352076456ae38bc0f4cc79c