Malicious PDF — malware analysis report

Static analysis result for SHA-256 10cdadf1718732a3…

MALICIOUS

PDF

71.1 KB Created: 2021-03-28 09:59:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: eae4c458de65b296e45585bfda5d6ff0 SHA-1: 523c3b6d2126607de9af02d3c9390c47ee137a9d SHA-256: 10cdadf1718732a376888a03093a70b11fd505abca1faf745a0d0f9b58c20f28
186 Risk Score

Malware Insights

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

This PDF document was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, indicating it is likely part of a link farm designed to redirect users to potentially harmful websites. The document body is heavily obfuscated and appears to be generated content, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://druttle.ru/award?keyword=amplitude+modulation+using+matlab+pdf PDF link annotation
    • https://cdn.sqhk.co/panafilaputu/fklSgdI/parent_plus_loan_deferment_covid.pdfIn PDF document text
    • https://cdn.sqhk.co/gorisaburo/Aghiehg/42583845112.pdfIn PDF document text
    • https://cdn.sqhk.co/bufudoraxala/g7ghgjA/funny_video_tik_tok_share_chat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501501/normal_60601434052e6.pdfIn PDF document text
    • https://nijuvabuf.weebly.com/uploads/1/3/5/3/135326727/wedufarogabar-vobisegirej.pdfIn PDF document text
    • https://cdn.sqhk.co/zikegasenar/hbheJ8N/31808646395.pdfIn PDF document text
    • https://cdn.sqhk.co/nuxasedazu/mMhd3if/baseball_vs_zombies_mod_apk_android_1.pdfIn PDF document text
    • https://cdn.sqhk.co/zegegajugot/hdhfics/animal_crossing_pocket_camp_villagers_per_level.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451018/normal_5ff5ffd251bd6.pdfIn PDF document text
    • https://cdn.sqhk.co/gusejemife/aeCjalh/27425191413.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420767/normal_6007502c51de5.pdfIn PDF document text
    • https://cdn.sqhk.co/serodozire/jdjdjgJ/panugosopales.pdfIn PDF document text
    • http://pupesotiv.22web.org/flower_duet_sheet_music_scribd.pdfIn PDF document text
    • https://votopugukoz.weebly.com/uploads/1/3/5/3/135315446/gubiz_zarosivonajet_tiworuzezi_taduvob.pdfIn PDF document text
    • http://gozetixo.iblogger.org/discourse_on_the_origin_of_inequality_analysis.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/Coljfza/20686375296.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426682/normal_6043542b8c8d0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f187853a-68e6-4ed6-a420-9593b89d6738.filesusr.com/ugd/27c34a_e6438ba374b44f609df3e32c75676524.pdf?index=trueIn PDF document text
    • https://a4346b84-4611-49ab-b113-80c9188ca613.filesusr.com/ugd/078c79_76cbf5467ca445b4af3333fade16e237.pdf?index=trueIn PDF document text
    • https://1e8c0764-4a0f-46ab-84a2-5f63a8a44928.filesusr.com/ugd/6a0acf_73a674c89aad47728b84bede33d06814.pdf?index=trueIn PDF document text
    • https://1df32be7-5e6a-491e-80e4-5c558052ef26.filesusr.com/ugd/e02e08_34b38a28fa494b2eb7b01210164eeaaa.pdf?index=trueIn PDF document text
    • http://konuxosukizegu.rf.gd/como_hacer_una_propuesta_de_trabajo.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d44b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD44B 5392 bytes
SHA-256: e88fc21333626d7958d9f582e2af6bc0b3a67f760abd6be0ee1799dd295289be
font_01_sfnt_off0000e68c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68C 11760 bytes
SHA-256: b3552583222e4a213fe0547287b8191377728a71b72006af22f5d16ed0fbbf1e