Malicious PDF — malware analysis report

Static analysis result for SHA-256 2338bbb21ea9c92a…

MALICIOUS

PDF

78.9 KB Created: 2021-03-30 06:44:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: ae5dc80015424776a3bd8170eec02b65 SHA-1: d81ea9f8ef7197941ba06bb938a4b8dd48c44975 SHA-256: 2338bbb21ea9c92a0f120e955e20d4f08e861035f04b9cd702d1b48ee8639ef2
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

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://botokaw.ru/strik?utm_term=how+do+you+make+crockpot+chili+thicker PDF link annotation
    • https://cdn.sqhk.co/vibebexez/higf5id/animal_hospital_cantiague_rock_road.pdfIn PDF document text
    • https://cdn.sqhk.co/xavonepez/hJggrgg/motorcycle_shop_near_me_open_on_sunday.pdfIn PDF document text
    • http://ratulave.22web.org/38320046410.pdfIn PDF document text
    • http://lerimofo.mywebcommunity.org/pexafosaf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/aee6283a-ca4d-4c82-9347-81e4f114f435/bible_new_testament_audio.pdfIn PDF document text
    • https://s3.amazonaws.com/mipizaju/78339491682.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/028b76f5-e8e5-4333-b00e-671439db8220/collectors_2020_korean_movie_watch_online.pdfIn PDF document text
    • https://s3.amazonaws.com/lazolu/soxepiwuvarir.pdfIn PDF document text
    • http://jajogagek.atwebpages.com/2006_can_am_outlander_800_service_manual.pdfIn PDF document text
    • https://bf6af823-cb0d-4ee8-9d5b-4f0b1de5ed24.filesusr.com/ugd/9eb187_f752e0dd4de94bf4adba3df4d7bec153.pdf?index=trueIn PDF document text
    • http://vawerudarasikow.myartsonline.com/afmc_admission_circular_2020_19_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18dbb111-746d-4bf6-9218-f044c52dcf78/sun_joe_spx3000_instruction_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/319d7b34-b48a-4ed1-a26a-59952fcb4d69/nordictrack_t7si_manual.pdfIn PDF document text
    • https://55963656-6eb1-4b25-bcd5-bb835d65808b.filesusr.com/ugd/0064ae_64e19403dccb4f93bc0f70eafc85f619.pdf?index=trueIn PDF document text
    • https://c33c3ce4-fa2f-4f19-9477-7a801b41b29e.filesusr.com/ugd/ebbcbd_bf5813ba1ce34ae4be075d0d74960e38.pdf?index=trueIn PDF document text
    • http://junenizexi.epizy.com/28922814774.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_off0000f6ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CE 5352 bytes
SHA-256: 07bd82d1beac54c4ea8efaa9b0f6e2be70614f4e0e093e816237e989e1487d47
font_01_sfnt_off000108e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E9 10788 bytes
SHA-256: 115372594b974d38cc5ebe3bdcc59476bfc1cb3ed7d7a2cdc4c3d6128a71b243

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