Malicious PDF — malware analysis report

Static analysis result for SHA-256 02a8440b44b38b67…

MALICIOUS

PDF

85.7 KB Created: 2021-03-17 17:53:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 942985642ae74b1e035306afaa4a1578 SHA-1: ec0271e56447e679e3a2440cd2b21c1dc2b81842 SHA-256: 02a8440b44b38b67468dc2a8a1f83cc7206686a74c30be4fe5ffd7f7832a176c
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting an attempt to manipulate search engine results or redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://lozipotod.ru/wix?keyword=borderlands+pre+sequel+gibbed+codes+imgur
    • https://kexibisurek.weebly.com/uploads/1/3/4/3/134334279/mevefakunotul.pdf
    • https://ragesetenavuxom.weebly.com/uploads/1/3/1/6/131606186/lodem.pdf
    • http://bewizasosu.sportsontheweb.net/what_order_should_i_read_the_halo_books_in.pdf
    • https://wijekuwonud.weebly.com/uploads/1/3/4/6/134645716/bivizoxa.pdf
    • https://cdn-cms.f-static.net/uploads/4407064/normal_6039b6e9406b9.pdf
    • http://rexonina.medianewsonline.com/zovomabuxavusopoz.pdf
    • https://cdn.sqhk.co/jogeguzotire/hhjc7je/85561402914.pdf
    • https://cdn-cms.f-static.net/uploads/4404745/normal_603be278b573d.pdf
    • https://cdn.sqhk.co/luwukamuku/gVPnY0R/yahoo_finance_spy_performance.pdf
    • https://rewazifepa.weebly.com/uploads/1/3/4/6/134664269/buxudog-ranevilog.pdf
    • http://tuzirawejaw.mypressonline.com/talexewe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/378909d1-7719-4f37-b835-55aa84a00029/harlan_ellison_books_amazon.pdf
    • https://uploads.strikinglycdn.com/files/fc06fc0f-7b3c-4713-8ae2-12b6ca6f585b/online_survival_games_pc_free_download.pdf
    • https://uploads.strikinglycdn.com/files/f10d5b8d-745d-4c75-80c7-6cff2dd385f8/how_to_write_a_good_news_article_title.pdf
    • http://raxegujanamefas.atwebpages.com/dajugolofon.pdf
    • https://uploads.strikinglycdn.com/files/3323747c-38ed-46f7-b087-4fbaf2ce1c0c/jatevagelumu.pdf
    • https://uploads.strikinglycdn.com/files/bfc57b1c-da1b-4c11-a403-24ff5c16f850/banapodaxuwigekopibala.pdf
    • https://uploads.strikinglycdn.com/files/c43ab6ee-0eab-46e1-968f-078478abe841/39701539049.pdf
    • https://uploads.strikinglycdn.com/files/5d8494db-9fcf-4eed-8cfc-f89c053bbecb/facebook_help_centre_live_chat.pdf
    • https://uploads.strikinglycdn.com/files/0e9e40ab-dd23-4690-b74a-98a683cf1a16/xiwetima.pdf
    • https://uploads.strikinglycdn.com/files/cead5b29-4254-4902-94cd-d1b58ff99b6e/how_to_skip_count_by_7.pdf
    • 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_off00010fab.bin
b7c5db7a884e8328983928b82a27a23c29d86dde8c8b5447c213c38f0292963c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAB 5708 bytes
font_01_sfnt_off000122f4.bin
c302200823b611afede4b52f90bbc26b2b8bd3133bc62871ee23068909d59446		 pdf-font-stream PDF embedded font (sfnt) at offset 0x122F4 11464 bytes

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