Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef70108100f371a4…

MALICIOUS

PDF

76.5 KB Created: 2021-03-01 22:47:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: b7a6ab16b84dc304c2f82532652529e2 SHA-1: fea3d1eb1187dc192db1341329265e94a512197e SHA-256: ef70108100f371a4df7841f967a9622fbaa1dbf27f7b34726f2c7d631d1268c9
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a machine learning model and ClamAV, indicating malicious intent. It contains numerous embedded URLs, with at least two pointing to suspicious domains that appear to be part of a link farm designed to redirect users. The presence of these links and the overall structure suggest a phishing or malware distribution campaign.

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://seumenha.ru/123?utm_term=pl+sql+dbms+output+sql+developer PDF link annotation
    • http://wemuwetafivaxe.sportsontheweb.net/31033886509.pdfIn PDF document text
    • https://cdn.sqhk.co/wirubetena/Ihezibr/vuwivewat.pdfIn PDF document text
    • http://xoxinusenavi.66ghz.com/ebay_app_for_android_tablet.pdfIn PDF document text
    • http://zanatax.22web.org/hp_officejet_7110_manual_service.pdfIn PDF document text
    • http://lojapidabud.mypressonline.com/46409475186.pdfIn PDF document text
    • http://ru-en.xyz/kogagiwerufidexezikaxinaz48mj.pdfIn PDF document text
    • http://bometaximom.scienceontheweb.net/fidirewujugigaxe.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/dibedamoka/21128207938.pdfIn PDF document text
    • https://s3.amazonaws.com/pazovugal/29237659631.pdfIn PDF document text
    • https://s3.amazonaws.com/zasepo/69888158272.pdfIn PDF document text
    • https://s3.amazonaws.com/jikopot/clannad_anime_parents_guide.pdfIn PDF document text
    • http://mowowaruxuxizim.rf.gd/garmin_nuvi_55lmt_map_update.pdfIn PDF document text
    • http://jamivofobo.rf.gd/97555708.pdfIn PDF document text
    • https://s3.amazonaws.com/solonebosop/hoover_floormate_spinscrub_replacement_parts.pdfIn PDF document text
    • http://xemunebo.atwebpages.com/microsoft_project_tutorial_video_free_download.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_off0000e4e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E0 5220 bytes
SHA-256: 4d7708be540f83326c7cf1f646d391a083254ec114c53af4e2c4c68b3ce44435
font_01_sfnt_off0000f680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF680 1800 bytes
SHA-256: 6d2a3a16cc464ce72cf05976c7f96a31c93af2202e0dc760c37a694345e222ee
font_02_sfnt_off0000ff10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF10 10992 bytes
SHA-256: 06481bdfc2e4a6ed3c36ebb9d3f3a66cac23e26010a8cc240dac42ea62bb6cf9

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