Malicious PDF — malware analysis report

Static analysis result for SHA-256 0aa03e799cb598f1…

MALICIOUS

PDF

74.7 KB Created: 2021-03-25 03:54:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 804233cd104da238a30864d8c8ea068b SHA-1: dd829b0e7f661f834bc77980a7f677c54339aaa5 SHA-256: 0aa03e799cb598f1f421b310e6f156cae7bb4e9a0390a162e78e6cd839bf5c17
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, suggests a lure related to 'Predicting moon phases worksheet answers', likely intended to trick users into visiting malicious URLs for phishing or malware delivery. No scripts were extracted, but the extensive use of external links and the high-risk heuristics indicate a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://dafemum.ru/strik?utm_term=predicting+moon+phases+worksheet+answers
    • http://pamatidela.getenjoyment.net/67201849347.pdf
    • https://static.s123-cdn-static.com/uploads/4369914/normal_6001726857de5.pdf
    • http://mowukedova.mypressonline.com/zinijixasemuzukojowidifor.pdf
    • https://cdn-cms.f-static.net/uploads/4382773/normal_604648cc6b953.pdf
    • https://cdn-cms.f-static.net/uploads/4490364/normal_600de6da19082.pdf
    • https://static.s123-cdn-static.com/uploads/4406789/normal_5ff77a2ccd79b.pdf
    • https://cdn-cms.f-static.net/uploads/4410989/normal_602e9dfbb89d6.pdf
    • https://cdn-cms.f-static.net/uploads/4385217/normal_5fd67978620fc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://niwimugosaz.onlinewebshop.net/nulir.pdf
    • https://9eff4bf0-55a5-42b9-a65a-250f23c32afd.filesusr.com/ugd/80978b_c840a919f946414b8ec96e7017cb5c7a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b18c4442-eae9-4c74-8421-0796255480da/22982938526.pdf
    • https://a98f38e8-5810-4fc9-be6a-c3d78c7c4f9f.filesusr.com/ugd/921909_f20bf0e65d0d4da8873f13b5cbb529f7.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c8b218f5-0725-4d46-8048-7eb5aa4fa05b/89507972779.pdf
    • https://uploads.strikinglycdn.com/files/90b2cffe-0361-4bd5-a5ce-07fbe3c9802d/18286609213.pdf
    • https://1cdd1dcb-54a5-4750-95ad-c4cce9a68cd1.filesusr.com/ugd/1e32c2_27a74f1661f149819304c0ba6c561371.pdf?index=true
    • http://gujomodezeroj.epizy.com/zibukanowaraxow.pdf
    • http://safedoguno.onlinewebshop.net/loving_someone_with_borderline_personality_disorder_download.pdf
    • https://68420551-d949-41c4-975b-2ae86aa6d062.filesusr.com/ugd/09c3c7_ecba7e9907a449ddaf18d47c1bab624a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4d065fed-6bf4-43e3-9c78-2c834dfd3148/lenovo_y510p_ssd_type.pdf
    • http://kopajadipovagu.rf.gd/understanding_business_11th_edition_chapter_1.pdf
    • https://uploads.strikinglycdn.com/files/db8c76ca-cd1c-4b35-af01-2bb187122fd0/liber_null_audiobook.pdf
    • https://bff5fdab-9fd0-4670-908b-a1308bb5a9cb.filesusr.com/ugd/227d0f_54c5b258779c4a50a756722a6c125f1d.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e645.bin
b79ded8021545239b15715e57140e3dea6c933cf3032bd1a279b04c223495ee1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE645 5612 bytes
font_01_sfnt_off0000f93b.bin
5a400d558118e1b6df2e82d8866cd9cde170c3595bf14f201b0297372d5e6fc5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF93B 10624 bytes

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