Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d7dd428ad6af95d…

MALICIOUS

PDF

83.0 KB Created: 2021-03-25 10:13:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 7c6daaf95e7c5133e1ae10436e5e91e1 SHA-1: 57a0fbd9e84a52e240c2446ba4b003f12e850ee4 SHA-256: 1d7dd428ad6af95d4e59b9aa20bce0d591f38fd90b8da67fd85935d2e02814c1
244 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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/award?keyword=meaning+of+market+economy+pdf In PDF document text
    • https://cdn.sqhk.co/rapigufagi/jfhiidh/download_stickman_tank_battle_simulator_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/fakupavod/JkCCPie/14746641235.pdfIn PDF document text
    • https://moxuvobojivoz.weebly.com/uploads/1/3/0/8/130873852/8109ed.pdfIn PDF document text
    • https://cdn.sqhk.co/fovomesit/gh5Jjji/the_sims_freeplay_cheats_apk.pdfIn PDF document text
    • https://rigozogukex.weebly.com/uploads/1/3/3/9/133986215/siwotam_xosusujekanosod_vaguve.pdfIn PDF document text
    • https://pevaluxuduta.weebly.com/uploads/1/3/4/5/134502983/283913a6.pdfIn PDF document text
    • https://cdn.sqhk.co/koxopumo/jroCgco/appradio_mode_vs_android_auto.pdfIn PDF document text
    • https://luzurojavozajin.weebly.com/uploads/1/3/6/0/136090511/bepobavodu.pdfIn PDF document text
    • https://cdn.sqhk.co/wibepudib/cdhhAyy/final_fantasy_xv_pocket_edition_apk_obb.pdfIn PDF document text
    • https://cdn.sqhk.co/penazavoxu/ieib854/can_you_get_acrylic_nails_done_while_pregnant.pdfIn PDF document text
    • https://cdn.sqhk.co/zimalodepafo/TYqieSt/dojup.pdfIn PDF document text
    • http://tulumiv.medianewsonline.com/modern_business_process_automation.pdfIn PDF document text
    • https://cdn.sqhk.co/fodibaniwe/dpgE5jd/71341437065.pdfIn PDF document text
    • https://cdn.sqhk.co/wifopuzuxiba/y6fgjjb/41536847286.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/rebesudanolo/magento_2_knockout_js_gettemplate.pdfIn PDF document text
    • https://949217f6-ecfc-4a1b-8806-967b2a145102.filesusr.com/ugd/b08fd2_51f0df07962d4af59f7e2121593f2c31.pdf?index=trueIn PDF document text
    • https://a3de454e-1598-42bb-a259-4eb69c42f179.filesusr.com/ugd/fb5067_072c85b4f07947d281033b16165e5125.pdf?index=trueIn PDF document text
    • https://95fbbc11-640f-4658-acdf-6e09da746871.filesusr.com/ugd/e42ee3_578ef3d97efc4cfaa6bb411184d25679.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ziwuvijevo/nedexowukenaf.pdfIn PDF document text
    • https://f9fc249e-2e6a-4908-9eb0-88005465a50d.filesusr.com/ugd/2530ee_54da55098de34e1b9e7cd241ed12691d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wezukep/all_caste_list_in_tamilnadu.pdfIn PDF document text
    • https://s3.amazonaws.com/sitok/puzzle_and_dragons_dungeon_guide.pdfIn PDF document text
    • https://c1bbde11-5cda-4f7c-8b74-b2fe90b484f5.filesusr.com/ugd/1c8c6c_0b470c0d437743f998e1f049c99a5619.pdf?index=trueIn PDF document text
    • http://mubodadekutaxim.atwebpages.com/didadi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF549 5224 bytes
SHA-256: f9f9f1abc8e844685234e06e4e3a7725763759f5a870989e2f7eb223e6e6ab64
font_01_sfnt_off00010703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10703 11532 bytes
SHA-256: cb5f138c136d62829c3166459ac8dfefc2ac945551645234df1e688d14ae7894
font_02_sfnt_off00012e84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E84 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361