Malicious PDF — malware analysis report

Static analysis result for SHA-256 7622a55985cb2b79…

MALICIOUS

PDF

81.2 KB Created: 2021-03-31 18:28:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 81ff2dd2d58ca2b2d5f343f10ecae711 SHA-1: 605b1118820af73e1f39e520968628545bc17c3b SHA-256: 7622a55985cb2b79747f1b8846512f40c743f7fe1843c59d002de167d8852d15
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a prominent one pointing to 'xajibur.ru' which is flagged as an external URI. Heuristics indicate the PDF is a link farm on disposable hosting, and ClamAV detection identifies it as 'Pdf.Phishing.Trojan'. The ML classifier also strongly flags it as malicious. The presence of these indicators suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xajibur.ru/award?keyword=free+math+books+pdf+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4493602/normal_605d6a44ed843.pdfIn PDF document text
    • https://cdn.sqhk.co/kesavaki/hQCieZb/temple_run_2_apk_download_free.pdfIn PDF document text
    • http://100naturals.fun/124455566708d3mm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481420/normal_601637a009a60.pdfIn PDF document text
    • http://nazhivy.net/my_zone_headphones_only_get_radioc8e7r.pdfIn PDF document text
    • http://itdiscount.info/wage_labour_and_capital_karl_marx_summary9pcjs.pdfIn PDF document text
    • http://zujadise.scienceontheweb.net/how_to_become_a_fluent_english_speaker.pdfIn PDF document text
    • http://niluwipewuxasa.medianewsonline.com/alter_ego_b2_free.pdfIn PDF document text
    • http://esclub.info/cbse_political_science_class_10_textbook_solutionsi8rw2.pdfIn PDF document text
    • http://amsidisi.xyz/516230096129uy8x.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489595/normal_5fed09969fee5.pdfIn PDF document text
    • http://eferevole.com/loxinopexurogedicto5q.pdfIn PDF document text
    • https://cdn.sqhk.co/benibavagoge/dZjothi/skyblock_roblox_wiki_fandom.pdfIn PDF document text
    • https://cdn.sqhk.co/kewesowovim/ecWYsjf/dead_in_the_box_mod_unlimited_money.pdfIn PDF document text
    • https://cdn.sqhk.co/minamojazi/MRiezqx/stackers_medium_travel_jewellery_box_blush_pink.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bokapobutiz.rf.gd/74510561082.pdfIn PDF document text
    • http://xumuritikoxuk.myartsonline.com/beyond_biocentrism_robert_lanza.pdfIn PDF document text
    • http://ridezajumoso.epizy.com/19185206435.pdfIn PDF document text
    • http://xafexuw.epizy.com/3111534976.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_off0001001c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001C 5532 bytes
SHA-256: 82cbbb034b837631193b142f50a73ff13cdef70c63c2bc1e836d7509758eb610
font_01_sfnt_off000112c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C9 10880 bytes
SHA-256: 10dcdf217026228c028ebd0c6658391e94c32dcc1ba750221d1200275dddb1c3

Open this report in the interactive analyzer, or submit your own file for analysis.