Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f9a71a7a652f05f…

MALICIOUS

PDF

105.5 KB Created: 2021-02-27 15:48:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a4c84b616bb70aa97bb04b5e61d44033 SHA-1: f5dc73911759a88481e92be08db2da45ea0720cb SHA-256: 0f9a71a7a652f05f844e5eac2f4aaca6f258d079157145edc5c91e578626561e
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

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://ponafet.ru/wix?keyword=top+5+iptv+apk PDF link annotation
    • http://reduslim-italia.website/novubobopmc.pdfIn PDF document text
    • http://kwini-fini.online/which_one_is_better_jbl_flip_4_or_5axv6b.pdfIn PDF document text
    • http://clobuss.ru/life_fitness_x5_elliptical_troubleshootingcuzst.pdfIn PDF document text
    • http://kismyketio.com/gimubarigizujitopuvavuo9a6j.pdfIn PDF document text
    • http://mmmuuuue.space/tops_switches_and_bottomshzbth.pdfIn PDF document text
    • https://cdn.sqhk.co/busumodofu/b1ABlgi/among_us_skeld_map_minecraft_tutorial.pdfIn PDF document text
    • https://cdn.sqhk.co/ranemagesoga/TMgdijT/fawodavejukalikub.pdfIn PDF document text
    • https://cdn.sqhk.co/rolileduvof/ara8hfT/siximuvuvaguf.pdfIn PDF document text
    • http://zdorovienashevse.xyz/luigis_mansion_iso_usazuxnd.pdfIn PDF document text
    • https://cdn.sqhk.co/serodozire/gjgjggv/cara_nak_register_qr_code_mysejahtera.pdfIn PDF document text
    • https://cdn.sqhk.co/jipuxoxukul/hbijjjP/tudupakajizubegedoro.pdfIn PDF document text
    • http://bigtittybella.com/hmrc_cumbernauld_vat_bank_detailsn1x7o.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bafimilatape.epizy.com/how_to_reset_liftmaster_keypad_code.pdfIn PDF document text
    • http://rajamuviw.epizy.com/vlookup_vba_from_another_sheet.pdfIn PDF document text
    • http://kuzipewas.rf.gd/how_to_cancel_force_defrost_samsung_refrigerator.pdfIn PDF document text
    • http://zumoriko.epizy.com/nofozu.pdfIn PDF document text
    • http://nilifujajug.epizy.com/manupirev.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_off000152e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152E4 3520 bytes
SHA-256: 8fc66a46ffd204d21d125222f2bb440718dfd66aa894b8adb9e4848be941e394
font_01_sfnt_off00015f93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F93 4704 bytes
SHA-256: 9f28f405a773f11f4ba12a2225ba47fd5b3cb54e56d1b49a7656f68c5a13c0f7
font_02_sfnt_off00016fb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FB5 12596 bytes
SHA-256: 4374705612d8a617ea89a3c1d9943e3fcfb1ed00d9863e5e70c3466c855c3551

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