Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7965f828b5a443e…

MALICIOUS

PDF

81.7 KB Created: 2021-03-18 01:51:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: a10bcfafbafd280f8babb1bb4277f52c SHA-1: 27c69ba45e292958f0846dbe8b196678a6abbcec SHA-256: d7965f828b5a443e8186f1db87a1d03740b3fea93c54d7da67d6e35ba0c380a4
166 Risk Score

Malware Insights

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

The PDF contains numerous links to disposable domains, many of which are disguised as document downloads. The heuristic 'SE_REMOTE_SUPPORT_LURE' indicates the document likely instructs the user to install or connect with a remote support tool, which is a common tactic for phishing or malware delivery. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://soxebez.ru/strik?utm_term=is+warm+or+cool+mist+better+for+humidifier PDF link annotation
    • http://scriptbook.xyz/618343928498hk6z.pdfIn PDF document text
    • http://itslm.fun/autocad_2018_rendering_tutorialira9z.pdfIn PDF document text
    • http://dvertsoff.ru/81080911101bl4e.pdfIn PDF document text
    • http://tvoyoproc.fun/dyson_motorhead_cordless_vacuum_reviewsgnl2w.pdfIn PDF document text
    • http://olymptrade.buzz/6686568652wk2fw.pdfIn PDF document text
    • http://fitness1.space/76599190380l716s.pdfIn PDF document text
    • http://shishkin-seed.xyz/mowozogalto6bu.pdfIn PDF document text
    • http://dumigegin.medianewsonline.com/digagapubegodipogig.pdfIn PDF document text
    • http://ig-mediateam.net/kixamatogububolrroy.pdfIn PDF document text
    • http://vertigoa.online/how_to_thread_a_free_westinghouse_sewing_machinehgiar.pdfIn PDF document text
    • http://xebubux.sportsontheweb.net/what_will_happen_to_your_eyes_if_you_cry_too_much.pdfIn PDF document text
    • http://meetdouche.xyz/zabebiwilev1pzi1.pdfIn PDF document text
    • http://dizititakozazi.mywebcommunity.org/10396134704.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lorerexeg/topical_antifungal_agents.pdfIn PDF document text
    • https://s3.amazonaws.com/feliso/background_flower_blue_vector_free.pdfIn PDF document text
    • https://167c2301-eccc-4e3a-a609-38a4f17b9bf8.filesusr.com/ugd/b1dabf_4223360cf90a4e338308e598fa749d4a.pdf?index=trueIn PDF document text
    • https://dc58184e-bbba-402a-8e08-a55d552c8f3f.filesusr.com/ugd/0ebc1f_bce1facfd5be4a0b890273d3f7975ab2.pdf?index=trueIn PDF document text
    • https://8c805f22-5240-4a8e-9b4d-8499607ff1fc.filesusr.com/ugd/76156b_22aeb9a97e0f46838825f7e7577cce4c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lomuper/sim900d_gsm_module_datasheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8b9d4e6-3293-4cce-94cb-20888d0cede1/asus_sabertooth_z97_mark_1_bios_update.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0176e670-bd51-47a7-93e8-df3548669880/96762568609.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_off000100ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AD 5428 bytes
SHA-256: cdbeaa9b0b715861126c5207853b0b95993c95b24a7d05d8fc852a96496d5d4e
font_01_sfnt_off00011303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11303 11220 bytes
SHA-256: ee0271e39195e97b2a702fdd623ad09a18ad4c2eb93549bef31c8c77e4789d13

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