Malicious PDF — malware analysis report

Static analysis result for SHA-256 31da961afd95c5eb…

MALICIOUS

PDF

68.5 KB Created: 2021-01-11 02:43:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 2cb84816f7eb63fb8e7c5d96e8af592c SHA-1: c8d8a74a363cad6bab59cb9b349dc4d402ac0332 SHA-256: 31da961afd95c5ebf7a66e54135b0e70f07ebc9e9469aa300032852f7618972a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which are hosted on disposable domains or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains references to product names and application details, likely serving as a lure to encourage users to click the malicious links.

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://trafffe.ru/123?utm_term=bushnell+banner+6-18x50+sunshade PDF link annotation
    • https://cdn.sqhk.co/ditetona/T89R7Ak/85073514064.pdfIn PDF document text
    • https://sagisumofag.weebly.com/uploads/1/3/4/8/134882066/a9c4f151b2.pdfIn PDF document text
    • https://site-1173209.mozfiles.com/files/1173209/real_football_2019_apk_offline.pdfIn PDF document text
    • https://site-1177836.mozfiles.com/files/1177836/vewomap.pdfIn PDF document text
    • https://cdn.sqhk.co/modajili/ijcjfjh/15028032565.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451567/normal_5fe01a92e60e7.pdfIn PDF document text
    • https://cdn.sqhk.co/kavejufa/IqNgchc/pocket_tanks_deluxe_apk_mod.pdfIn PDF document text
    • https://site-1218116.mozfiles.com/files/1218116/baahubali_2_video_song_masstamilan.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/busixakowun_zefisuni.pdfIn PDF document text
    • https://site-1177796.mozfiles.com/files/1177796/80164354880.pdfIn PDF document text
    • https://site-1179748.mozfiles.com/files/1179748/descargar_bigfoot_hunting_multiplayer.pdfIn PDF document text
    • https://site-1177169.mozfiles.com/files/1177169/groupon_merchant_services_phone_number.pdfIn PDF document text
    • https://site-1181117.mozfiles.com/files/1181117/zoom_cloud_meetings_app_free_download_for_macbook.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414701/normal_5f97c7c422d92.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC2F 5868 bytes
SHA-256: 678fc28c2ddca2120e59002dc478f3a38ce5fc1df663ea276e0e40018a74cdec
font_01_sfnt_off0000e02b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02B 10948 bytes
SHA-256: 4096b2397679b033f72d9762f06838d8b0ed8adec323f647d5e6c038bec67b3f

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