Malicious PDF — malware analysis report

Static analysis result for SHA-256 e431aca1f42be29e…

MALICIOUS

PDF

80.7 KB Created: 2021-03-09 09:07:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 921e6fb04d4d55728a438718132088a1 SHA-1: b8086bc98748ca5e491e350565bd0e0c998124ab SHA-256: e431aca1f42be29e5c0c2c63e63bce489020a646c020846ee57986d22bc0cd15
156 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which are designed to mimic search results or academic papers, likely to trick users into visiting malicious domains. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xezojetit.ru/award?keyword=buku+hmi+candradimuka+mahasiswa+pdf
    • http://fezusixikizagu.iblogger.org/homemade_wing_chun_training_equipment.pdf
    • https://cdn-cms.f-static.net/uploads/4415331/normal_603ccb5cbbadf.pdf
    • https://cdn-cms.f-static.net/uploads/4475570/normal_5fe98f70eedb7.pdf
    • https://cdn-cms.f-static.net/uploads/4387233/normal_5fd7b93ba6c65.pdf
    • http://paxezot.getenjoyment.net/kupekofopuralosugul.pdf
    • https://static.s123-cdn-static.com/uploads/4417226/normal_5fc7e476a7803.pdf
    • https://cdn-cms.f-static.net/uploads/4426418/normal_60394fcc1cade.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://e192e36c-395d-4660-9df6-aa7aed00c30a.filesusr.com/ugd/3aee12_5d6c2f8588ad43e5ad67cdeae207a8d1.pdf?index=true
    • https://3c2b787d-8465-4662-bdcc-bf736d584291.filesusr.com/ugd/8760e7_4a047b0f93864627a8a976d228fdff26.pdf?index=true
    • http://jigujirew.epizy.com/what_is_the_distinction_between_hypoeutectoid_and_hypereutectoid_steels.pdf
    • http://bobujosu.epizy.com/92768731934.pdf
    • https://aca56392-15ae-48e8-982c-fdf6c4ac0dc3.filesusr.com/ugd/00c070_8e16b60489114627b519f00e1cfbbff6.pdf?index=true
    • https://7e005a1c-fb68-43c1-af83-b854b6a2d282.filesusr.com/ugd/dcfb95_9c4df090c77f41ca8d122a42442c7cb3.pdf?index=true
    • http://faxajipemafeb.epizy.com/sunbeam_bread_maker_manual_bm2500.pdf
    • https://69b3109a-7cce-4514-9193-d2106d9976ab.filesusr.com/ugd/3c2969_d0cbe137bad44a788b355211856d672d.pdf?index=true
    • http://bugenerefajujus.atwebpages.com/nordic_track_pro_ski_machine_reviews.pdf
    • https://s3.amazonaws.com/kaxukok/lg_washing_machine_repair_guide.pdf
    • https://6d706a39-1f93-4f1a-9423-caccf7e65e71.filesusr.com/ugd/69f91f_43e3fa38102f4a4aa17f8c13aafc3435.pdf?index=true
    • https://1482387f-61d8-47e1-b538-9b7f1e8b89fb.filesusr.com/ugd/538d67_20698a1e36f548bfaa2a82574e18f929.pdf?index=true
    • https://s3.amazonaws.com/guvovigo/news_live_telugu.pdf
    • https://631ffb88-cf2d-4844-8d6b-9338a1b21cc5.filesusr.com/ugd/d24e6f_51cd34c4f2b94f93a2554d1ba1a9d669.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2c6.bin
39f83797cbca7cb3855cb3e3589ed07859713c0afb4ff0ea628f43504cd32f67		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C6 5140 bytes
font_01_sfnt_off0001041d.bin
d20885a66069b72b4999cf00db8246c9315696faa2f947ba1123e45ea7bcc171		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1041D 10212 bytes
font_02_sfnt_off00012727.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12727 4324 bytes

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