Malicious PDF — malware analysis report

Static analysis result for SHA-256 711f468c5156d01f…

MALICIOUS

PDF

67.4 KB Created: 2021-04-01 13:16:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 277df5436e902428580cc5b2d793d6b2 SHA-1: 131b4d760a729186ee8aa9f4eeac3fa130f6abbf SHA-256: 711f468c5156d01f45dfdbba5d1f6d94c9d16941521bf9b2dedde800e88ecaf7
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to disposable hosting or suspicious domains, indicating a link farm designed to distribute traffic to potentially malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/strik?utm_term=nordictrack+x7i+incline+trainer+manual PDF link annotation
    • https://jawubabob.weebly.com/uploads/1/3/1/0/131070379/funulupimos.pdfIn PDF document text
    • http://pedumerik.sportsontheweb.net/sunbeam_breadmaker_model_5891_instruction_manual.pdfIn PDF document text
    • https://xewixubigikuj.weebly.com/uploads/1/3/4/8/134892453/zawixumenox_nozofex_xutozipawele_niretago.pdfIn PDF document text
    • https://sazavilekin.weebly.com/uploads/1/3/4/8/134851962/xurubarefunen.pdfIn PDF document text
    • https://naxesitigas.weebly.com/uploads/1/3/0/7/130740165/tixefosa-gepuxofidemim-tejitexepiva.pdfIn PDF document text
    • https://tabogivazosepa.weebly.com/uploads/1/3/1/8/131871767/sawezagonasuvuzoke.pdfIn PDF document text
    • http://trickyturkey.com/ancient_magus_bride_episode_21lv0a2.pdfIn PDF document text
    • https://fakegegi.weebly.com/uploads/1/3/5/3/135312823/7691019.pdfIn PDF document text
    • http://bestpriceforukraine.xyz/31909351152ro62y.pdfIn PDF document text
    • http://vopagokiniki.mypressonline.com/darosekitejumuki.pdfIn PDF document text
    • http://tezibif.mygamesonline.org/securing_windows_server_2020_book.pdfIn PDF document text
    • https://vamekalufigo.weebly.com/uploads/1/3/1/1/131163651/7187055.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/sepovutapakogaf/50913992264.pdfIn PDF document text
    • https://ae0ecf71-49bb-4ac4-bba4-d0f2a20d1af9.filesusr.com/ugd/668a47_11638f87c2ce47e19e060e1dafb9a166.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kukupunopedon/japibukiginebolopogarefal.pdfIn PDF document text
    • https://06ebba1c-c738-45d4-b58d-83edbdcc9420.filesusr.com/ugd/b14caa_11c348b2566241bd834471c362ec5a67.pdf?index=trueIn PDF document text
    • https://a04ad255-06d6-4b17-97e7-91173d300295.filesusr.com/ugd/6864df_a69ae6e635174914b589828afca0c85a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nuxepiduded/donusu.pdfIn PDF document text
    • https://203e7bc3-08d7-4ecc-a8df-f797e0d4a079.filesusr.com/ugd/d4579c_3002f7a56b944ecc901cb8f7b34ee1c3.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C8 5088 bytes
SHA-256: 63e7e3628af1486268c9df6187834801a7a6814c04d4f209b238e24b370c979a
font_01_sfnt_off0000db13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB13 10452 bytes
SHA-256: 2ad63f6d49a785237fead316f08e4e1003ad7a779350afaf1f15950c453eea2e

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