Malicious PDF — malware analysis report

Static analysis result for SHA-256 d56934497552b96c…

MALICIOUS

PDF

97.9 KB Created: 2021-06-05 23:48:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 8c8db8937682c824f3a56637d6fb966f SHA-1: 3c660b2549672be6d1f3a96053bb98e70409c5ac SHA-256: d56934497552b96c86fab8b04398b5823b016a58afb9c353f5387918e032ef5d
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 0.9992

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://leonvi.ru/123?utm_term=morphology+and+syntax+pdf PDF link annotation
    • https://subujokijaj.weebly.com/uploads/1/3/4/0/134096911/62a338d76ca9.pdfIn PDF document text
    • https://jifalutisapore.weebly.com/uploads/1/3/4/7/134772579/tovugiwekotebira.pdfIn PDF document text
    • https://vabakapis.weebly.com/uploads/1/3/1/4/131453405/1367735.pdfIn PDF document text
    • https://zuberexuwaxif.weebly.com/uploads/1/3/4/5/134501439/lovemedegik.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://subazim.pbworks.com/f/exercice_sur_le_groupe_nominal_6eme.pdfIn PDF document text
    • http://mizunebapod.pbworks.com/f/ali_kundilli_2_hd_izle_1080p.pdfIn PDF document text
    • http://favixose.pbworks.com/f/how_to_find_area_of_semicircle_with_diameter.pdfIn PDF document text
    • http://najajadux.pbworks.com/f/muvilunapurebaxizit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcf5c1da-adff-4ec3-b4a0-f5f873faf81d/asus_rt-n12_router_password.pdfIn PDF document text
    • http://mapijakemifo.pbworks.com/f/labokugexujoluki.pdfIn PDF document text
    • http://gafuxexosaru.pbworks.com/w/file/fetch/144666708/dakarozupoxakawav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2e08725-581a-4a8f-831a-b7c4e38322a8/microsoft_visual_basic_express_2015.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e266511a-dd97-416f-8833-252c90888211/61907968639.pdfIn PDF document text
    • http://zuvuzut.pbworks.com/f/how_to_calculate_sample_size_for_a_retrospective_study.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d370eaa-4a55-4a55-a748-99816726e53d/a_clash_of_kings_1.2_mount_and_blade_warband_mod.pdfIn PDF document text
    • http://pebenuziwi.pbworks.com/w/file/fetch/144547341/pode_se_engravidar_depois_da_menstruao.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b185629c-3ed5-4a60-a2b0-9d1e32428dfe/what_is_marxist_criticism.pdfIn PDF document text
    • http://gafuxexosaru.pbworks.com/f/can_you_put_a_on_a_kindle.pdfIn PDF document text
    • http://mosijiv.pbworks.com/w/file/fetch/144424395/59086096726.pdfIn PDF document text
    • http://gupiguna.pbworks.com/f/94433889917.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ff01dce-7a61-4e04-8e0b-ca89f8b2d1f3/jajujani.pdfIn PDF document text
    • http://mujefapufefi.pbworks.com/f/autocad_training_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5539555-2992-4af7-a162-1b7a8f04262a/platicas_pre_bautismales_en_chihuahua.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20aa5dae-a86d-4941-9864-a2bd042cf424/xurisojidaguseremipoki.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000136fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136FD 5476 bytes
SHA-256: 0196558d4ba2c36455803c1b1ac1a086909227ef14c9e9aa1c77a6d162e82936
font_01_sfnt_off000149bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149BB 15040 bytes
SHA-256: eeb60807172ec561af1edccedff762b93af7efa470b0475d6238e5db1d8d1329