Malicious PDF — malware analysis report

Static analysis result for SHA-256 1101f7782ff20a55…

MALICIOUS

PDF

75.2 KB Created: 2021-06-11 04:13:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a8e38138d779b25b2e43db1cae9d88c4 SHA-1: dea8352e5623de441824e3c9639a8011e86eb4d3 SHA-256: 1101f7782ff20a55ddbbf606ef569bab5b98aafd4aa4d4538fe0fdb607a829ef
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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
  • 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://philabc.ru/pbw?utm_term=live+sports+amazon+firestick
    • https://bitigufej.weebly.com/uploads/1/3/5/3/135337089/fikodikapawopalot.pdf
    • https://gimimelaxagoke.weebly.com/uploads/1/3/2/7/132740951/neximija_xomagojodat_ladabu_vevadap.pdf
    • https://ditutemisa.weebly.com/uploads/1/3/4/3/134381329/657079.pdf
    • https://burubigek.weebly.com/uploads/1/3/4/8/134884838/goraxebewezifilifol.pdf
    • https://zisusanizapan.weebly.com/uploads/1/3/0/7/130775047/buregepepubaxoj.pdf
    • https://zobatovegu.weebly.com/uploads/1/3/0/8/130873738/wusibajunamofebepus.pdf
    • https://kugasesilij.weebly.com/uploads/1/3/4/7/134702015/bamojuvibaximo.pdf
    • https://jelezasi.weebly.com/uploads/1/3/5/3/135347821/1239523.pdf
    • https://lawepisofav.weebly.com/uploads/1/3/4/4/134473025/b8435574bc5430.pdf
    • https://gopikuximodel.weebly.com/uploads/1/3/1/3/131384340/7022855.pdf
    • https://letezinujafi.weebly.com/uploads/1/3/4/9/134901841/jedilaziwovavomigubu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nipekari.pbworks.com/w/file/fetch/144717714/figuras_en_plano_cartesiano_con_coordenadas.pdf
    • http://mazibudikor.pbworks.com/f/what_are_5_examples_of_phrases.pdf
    • https://uploads.strikinglycdn.com/files/9d464115-1694-4af2-a18b-3af4c06a50e6/5353741334.pdf
    • http://xeromilidunu.pbworks.com/f/89551244138.pdf
    • http://zegugas.pbworks.com/f/fudipebosor.pdf
    • https://uploads.strikinglycdn.com/files/24ea8cf6-b2f5-4044-8394-1b40250d613f/animal_farm_ch_7_8_summary.pdf
    • https://uploads.strikinglycdn.com/files/619828ae-a4cf-46ee-ada8-343bd2d21d50/does_samsung_a40_have_wireless_charging.pdf
    • https://uploads.strikinglycdn.com/files/f9a719d9-8e40-43f1-85c3-88ff071eaa9f/59572685869.pdf
    • http://momukaduwe.pbworks.com/w/file/fetch/144899745/no_problem_full_movie_free_download_mp4.pdf
    • http://gosirata.pbworks.com/f/acer_aspire_5742_drivers_download.pdf
    • http://vafakana.pbworks.com/f/libro_de_biologia_ii_bachillerato.pdf
    • http://sekodegaxex.pbworks.com/f/video_after_effects_pro_apk_free_download.pdf
    • http://ritijix.pbworks.com/w/file/fetch/144529347/nonton_film_foxtrot_six_sub_indo_hd.pdf
    • http://gaxoxim.pbworks.com/f/38203446538.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_off0000e71a.bin
0b4c1abd5b61f17a25e054829616bc102b80680abbcf1e026f914824c812f7b9
pdf-font-stream PDF embedded font (sfnt) at offset 0xE71A 5244 bytes
font_01_sfnt_off0000f8f5.bin
2f4b558f70f9a0a0861c85258e7a23e5fb025b73e11ca3e8c676fffcf571451f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F5 11236 bytes