Malicious PDF — malware analysis report

Static analysis result for SHA-256 715a4ba4755aa728…

MALICIOUS

PDF

75.9 KB Created: 2021-03-23 14:57:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 057da6655dea63bfb8df8bd7c1aebe87 SHA-1: de28d2994916291daf03b1c96078c5f2d611997f SHA-256: 715a4ba4755aa728d9ddf2053fbbe775060c7fa67378324c71163f5d86ae892b
184 Risk Score

Malware Insights

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

The file is a PDF containing multiple embedded URLs, with several pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms the presence of links to malicious redirectors, and 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic to obscure the true destination. The document body is heavily obfuscated, but the presence of URLs and the heuristic firings point towards a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 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/wix?keyword=declares+laws+unconstitutional In PDF document text
    • https://fitimunelesim.weebly.com/uploads/1/3/4/9/134900430/5a2f1869.pdfIn PDF document text
    • http://you-bestshop.xyz/who_is_the_creepy_girl_in_50_shades_darkerd8i4k.pdfIn PDF document text
    • http://help-feedback-amzn6.xyz/masonivakupawiwuwirnoe8p.pdfIn PDF document text
    • http://internet-babki.ru/93156813890g46xx.pdfIn PDF document text
    • http://ronitojaxebibo.22web.org/28361367989.pdfIn PDF document text
    • http://lireveputejat.iblogger.org/im_starved_or_im_starving.pdfIn PDF document text
    • https://favexolifuluk.weebly.com/uploads/1/3/6/0/136092880/kebuk.pdfIn PDF document text
    • http://mosaniz.22web.org/gagajaxiwo.pdfIn PDF document text
    • https://cdn.sqhk.co/zubuwebofe/cjjIijA/98190843048.pdfIn PDF document text
    • https://cdn.sqhk.co/tuxonewebuke/jgZniil/art_painting_wallpaper_free_download.pdfIn PDF document text
    • http://nutristrike-shop.ru/moxutojovinosutorexalirnjm1.pdfIn PDF document text
    • http://atomyimperial.ru/defiant_in_wall_digital_timer_instructionsgiif1.pdfIn 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/0769b66d-a04a-4c9a-9e10-97cfba393915/standard_abbreviations_for_books_of_the_bible.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/630f34b8-1236-44f3-88b2-a9cbea7bf585/monster_girl_maker_2_online_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0672391-660e-4890-876d-4a8ffd7485a9/fuzobisonetufideze.pdfIn PDF document text
    • http://serulasev.rf.gd/25329934225.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/772ba86b-1f69-444b-a428-a190b80dc0e2/plantronics_voyager_legend_pairing_mode.pdfIn PDF document text
    • http://pomolado.epizy.com/25142069883.pdfIn PDF document text
    • http://vegobojogaroju.rf.gd/dolexobawepaw.pdfIn PDF document text
    • http://rezekeruj.rf.gd/zanijetidugigo.pdfIn PDF document text
    • http://puzexexaniledow.epizy.com/navipatofod.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_off0000e9b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B5 4884 bytes
SHA-256: 0865e7c021b6f6e40785f972092e47397286e8ff7de355ebb5522fd7615eceb0
font_01_sfnt_off0000fa77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA77 11336 bytes
SHA-256: a2faeafbfffd2c6eb41ca7d969cc076fa193c32de756bf3e0498141d86da708c

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