Malicious PDF — malware analysis report

Static analysis result for SHA-256 2857dea9567a3bd6…

MALICIOUS

PDF

87.2 KB Created: 2021-05-01 02:39:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c5a7765d7ebfc7538c3c46b1f6f8fd85 SHA-1: 089436060a19d54f2787f72d207c343548a5b1b3 SHA-256: 2857dea9567a3bd6be5a60e41e58e8c89a424309e96855c473e63a6239f78601
126 Risk Score

Malware Insights

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

The PDF contains multiple external URLs, some hosted on disposable domains, suggesting a phishing or malware distribution attempt. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a pattern of creating numerous links on low-reputation domains, often using UTM parameters to track clicks. While no scripts were explicitly extracted, the presence of external links and the ML classifier's high confidence score point towards malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • 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://fokemale.ru/strik?utm_term=physics+for+gearheads+free+pdf PDF link annotation
    • http://de-bewertung-889562.icu/what_does_deterrence_mean_in_crimeepz63.pdfIn PDF document text
    • https://cdn.sqhk.co/nebinefis/geIielM/world_of_tanks_assistant_download_mac.pdfIn PDF document text
    • http://lasleymarkt.ru/refovifazuvaganuvikh4hi0.pdfIn PDF document text
    • http://igclienteam.com/24892752460ddegk.pdfIn PDF document text
    • http://bamiluzigu.mygamesonline.org/gasegodejenasonuge.pdfIn PDF document text
    • http://rolopigabetitu.scienceontheweb.net/mizug.pdfIn PDF document text
    • https://cdn.sqhk.co/wesuwajil/aFgchQr/neha_kakkar_all_songs_youtube.pdfIn PDF document text
    • https://cdn.sqhk.co/jesupasuzoku/cqdZLii/63207600768.pdfIn PDF document text
    • http://mizejodaf.mywebcommunity.org/vupepoz.pdfIn PDF document text
    • http://tigafik.mygamesonline.org/zananupinomam.pdfIn PDF document text
    • https://cdn.sqhk.co/dugelabomaw/bpzNhdq/vepusewe.pdfIn PDF document text
    • http://gratoramaa.space/5662951265898f4v.pdfIn PDF document text
    • http://jenerotisa.mywebcommunity.org/gastroesophageal_reflux_disease_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/fimegasaz/Zgjf765/30509438141.pdfIn PDF document text
    • https://cdn.sqhk.co/rasufizo/TgeSwAX/foreign_policy_magazine_wikipedia.pdfIn PDF document text
    • https://cdn.sqhk.co/vomisape/ACjgjgd/domino_pizza_near_me_delivery.pdfIn PDF document text
    • https://cdn.sqhk.co/sutazojawote/gez7if1/bumowasabowote.pdfIn PDF document text
    • http://lnstagram-copyright-confirms.com/491792216004p1ai.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
    • http://xileluzazisazit.epizy.com/shoei_neotec_2.pdfIn PDF document text
    • http://jibimom.myartsonline.com/english_synonyms_and_antonyms_list_download.pdfIn PDF document text
    • http://pefuganut.epizy.com/albert_einstein_theory_of_everything.pdfIn PDF document text
    • http://vimixof.onlinewebshop.net/35202701073.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FF 5092 bytes
SHA-256: 406b879ba072e30f5d05310da14cd6db1fa09e8f14b9e6c90c843e1de5457f01
font_01_sfnt_off00010659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10659 10828 bytes
SHA-256: 99729842cfba2c450b84ea6c7459a16f34036a60367d9996595465ec1a1bc923
font_02_sfnt_off00012b90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B90 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd
font_03_sfnt_off000140bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140BD 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f