Malicious PDF — malware analysis report

Static analysis result for SHA-256 aad3ab471a4e7c7c…

MALICIOUS

PDF

84.9 KB Created: 2021-03-11 15:25:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 7e97a5dcbe044e67a5b2b065c1cd9dc0 SHA-1: c97d63ba46af0466ad8b5cdd67bd06d13980ce2b SHA-256: aad3ab471a4e7c7c298584f0a40dbab0f5bedacc84251559f557a7534c6fd781
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or redirection scheme. The ML classifier strongly indicates maliciousness, and the presence of external URIs points towards an attempt to redirect the user to potentially harmful content. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 4

  • 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://seumenha.ru/123?utm_term=four+row+cylindrical+roller+bearings+skf+pdf PDF link annotation
    • http://digitalmicroteter.xyz/ropipodejitunprc5i.pdfIn PDF document text
    • https://cdn.sqhk.co/zogobadakedu/bAjjxhf/hit_and_run_cast_2009.pdfIn PDF document text
    • http://kengoru.space/125387241069gc69.pdfIn PDF document text
    • http://shoplus.info/stihl_she_71_electric_blower__vactu9cw.pdfIn PDF document text
    • http://pet-guru.shop/kipejamufavonauj77x.pdfIn PDF document text
    • https://cdn.sqhk.co/samanugutu/RifuKXV/66558752913.pdfIn PDF document text
    • https://cdn.sqhk.co/bolukawet/HifigNC/ranger_vs_zombies_hacked_download.pdfIn PDF document text
    • http://pisifivomi.22web.org/pukewiberokusojirogifat.pdfIn PDF document text
    • http://ecoservice-vlad.ru/lozatikcr24o.pdfIn PDF document text
    • http://storezone.info/gollux_prequest_guide_2020uho13.pdfIn PDF document text
    • https://cdn.sqhk.co/soxuvezosapa/jgguhhT/guitar_solo_ringtones_iphone.pdfIn PDF document text
    • http://f13x.xyz/57794120588n33op.pdfIn PDF document text
    • http://alesyasemiletova.com/vemadua3glq.pdfIn PDF document text
    • http://vinorama.fun/history_of_atomic_theory_chart_answer_keyytlvm.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://saziwujezad.epizy.com/85185538844.pdfIn PDF document text
    • https://3c8197b3-f999-4f29-b3da-fbdfea3dbf34.filesusr.com/ugd/0047a4_635e038a2d284e1c8c033b176605829e.pdf?index=trueIn PDF document text
    • https://f9c81679-ddb1-4746-ab40-32673edc426c.filesusr.com/ugd/2eff39_97d3119389204fbf9ef9dfd50375560a.pdf?index=trueIn PDF document text
    • https://945b3f91-9c76-4178-be32-f0dab3cfe2c6.filesusr.com/ugd/8d5d69_eac3638f6f5f45838fefaa658687083e.pdf?index=trueIn PDF document text
    • https://d926c97b-7f3b-4ec8-a52a-318bcb589338.filesusr.com/ugd/120f26_1e4e3688544f4261b619d377347e0b53.pdf?index=trueIn PDF document text
    • https://436010f1-0dd7-4950-aec0-3bdf337573e8.filesusr.com/ugd/5a4c69_d52ae9b4cd23443cb67c7738e0ddabba.pdf?index=trueIn PDF document text
    • https://680e7e7f-99bb-4309-8a01-ecc910dc7690.filesusr.com/ugd/717a42_c4523ee6abd843b5809d8e0ef086c9c3.pdf?index=trueIn 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_off0000eb4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4C 5476 bytes
SHA-256: a7b35b3d143f914adade9a292fe81a952336745bf177bd7456a3363875568a3d
font_01_sfnt_off0000fe0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0F 10544 bytes
SHA-256: 5711190d73b3afe58aac757d074c7dae38749cb220fd26f71dbb0e6c5ce1440d
font_02_sfnt_off0001223d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1223D 16164 bytes
SHA-256: 4bd16c8abd39118228c1571b0005d4eb3b3e943e572fd92a2a80cfcb7b749349
font_03_sfnt_off00013752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13752 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c