Malicious PDF — malware analysis report

Static analysis result for SHA-256 2536c4d261821f51…

MALICIOUS

PDF

82.4 KB Created: 2021-05-13 10:28:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: a2f53999b486e833f78da3f9b8496399 SHA-1: 1a1c3a97a4011ef1cb789848e6877df5ba452205 SHA-256: 2536c4d261821f511da75ea5af56f6235982ba52aaffec91bc7e4b4920c1e94e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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://mezovuduw.ru/strik?utm_term=max+lucado+anxious+for+nothing+session+2+pdf PDF link annotation
    • http://prizinsta.online/72656211518zw5zi.pdfIn PDF document text
    • http://santand-es.com/warorijowi7fnm.pdfIn PDF document text
    • http://salea.site/how_to_program_a_comcast_remote_to_a_panasonic_tvu264q.pdfIn PDF document text
    • http://vodizurulenega.mypressonline.com/kiwumizinokasuzokap.pdfIn PDF document text
    • http://bijowuxupolapi.sportsontheweb.net/7626548371.pdfIn PDF document text
    • http://unreguezff.rest/8291178616fbc4h.pdfIn PDF document text
    • http://italy-small.space/the_little_prince_antoine_de_saint_exupery_plottia6t.pdfIn PDF document text
    • http://familyit.pro/hp_officejet_pro_8625_e-all-in-one_printer_inkc136q.pdfIn PDF document text
    • http://videohost.space/mtg_biology_books_free_downloadhiso6.pdfIn PDF document text
    • http://itnegozio.info/xegasawadexowuzogukoza87hce.pdfIn PDF document text
    • http://lovelid.xyz/banenedu2wo8k.pdfIn PDF document text
    • http://navalny.design/21158123114h4ep6.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
    • https://1c019786-7048-4615-837a-ae53f087c4ae.filesusr.com/ugd/8b4172_4c24110d14304bdd8e6b4170e0a3aef5.pdf?index=trueIn PDF document text
    • https://6f2fb29c-15f2-4b08-b525-3eb91a7f0a41.filesusr.com/ugd/c3548c_acc0640349c444edbee27f721349acc2.pdf?index=trueIn PDF document text
    • http://zomimek.epizy.com/arjun_reddy_ringtone_free_background_music.pdfIn PDF document text
    • https://7893bdd6-41e4-48f6-9953-3a636dfb5d61.filesusr.com/ugd/c5c63b_e0ddf95ea966480aa776c9b9a3c6b327.pdf?index=trueIn PDF document text
    • http://dekutob.epizy.com/62895969080.pdfIn PDF document text
    • http://vezedusevu.rf.gd/all_the_missing_girls.pdfIn PDF document text
    • http://zapumodexajo.rf.gd/hipospadias_epispadias.pdfIn PDF document text
    • http://lurolubudoruk.onlinewebshop.net/9234250303.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C4 5504 bytes
SHA-256: 3e59af180a752429aa8b9a403036beadd224344cf69983ce32b9a18f2463d694
font_01_sfnt_off00010a7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7B 10560 bytes
SHA-256: a4df2af3772b6d530838367e739c48b0eecfa0c5e9ed15d2f5a4d3a9672f13b2
font_02_sfnt_off00012e52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E52 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3