Malicious PDF — malware analysis report

Static analysis result for SHA-256 668eaabf2f2b14ec…

MALICIOUS

PDF

77.3 KB Created: 2021-03-22 04:16:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 02685b570b238472bb51dda4ac5d4d07 SHA-1: 98ec0e72d2d404457452e1aaf701ff6a3dc4de5d SHA-256: 668eaabf2f2b14ecd84a1f1c4078afa728b77c153174d3d3988ff70d4cde72dd
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 by the PDF_SEO_LINK_FARM heuristic, pointing to other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through a link farm. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to potentially harmful content.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/wix?keyword=to+kill+a+mockingbird+exposition
    • https://fiwebafifike.weebly.com/uploads/1/3/4/8/134885554/wabuzopu.pdf
    • https://cdn-cms.f-static.net/uploads/4373016/normal_602942974b6ad.pdf
    • https://cdn.sqhk.co/goronikel/cgwjSic/67146384639.pdf
    • https://cdn-cms.f-static.net/uploads/4409110/normal_6047c41877299.pdf
    • https://rumitubo.weebly.com/uploads/1/3/4/5/134525427/rojazojubanirezefub.pdf
    • https://cdn.sqhk.co/gepabafi/ie5NoNn/xunolafuwitudanijukumate.pdf
    • https://cdn-cms.f-static.net/uploads/4387567/normal_600eca6ed0abf.pdf
    • https://cdn.sqhk.co/ripowusaro/ftifgib/40770734390.pdf
    • https://cdn.sqhk.co/fazologim/Ju3thjf/17165583635.pdf
    • https://cdn-cms.f-static.net/uploads/4450354/normal_6054aa14cb57f.pdf
    • https://rarinuda.weebly.com/uploads/1/3/5/3/135349313/8361479.pdf
    • https://static.s123-cdn-static.com/uploads/4416672/normal_5fcfee80a4f69.pdf
    • https://cdn-cms.f-static.net/uploads/4459916/normal_6057e8944127f.pdf
    • http://worabipupe.mypressonline.com/the_history_of_sexuality_vol_1_summary.pdf
    • https://cdn.sqhk.co/jaxubefe/mhjqKC7/how_to_find_hidden_files_on_iphone_11.pdf
    • https://cdn-cms.f-static.net/uploads/4450519/normal_6024768eab50e.pdf
    • https://bugajikiwolano.weebly.com/uploads/1/3/4/4/134471946/rexaditafitepi-nuzisusuf.pdf
    • https://duvikexa.weebly.com/uploads/1/3/4/7/134709262/wasakupowunu.pdf
    • https://cdn-cms.f-static.net/uploads/4464530/normal_600f356be9325.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://pisonepegosa.myartsonline.com/simowukosaveneteboxiruxi.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_off0000efe4.bin
f852d7a36be83a0bb4f7e2adefee998d3377533fb3da2e19d27e4ed5a715532c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE4 5616 bytes
font_01_sfnt_off000102e1.bin
acc0d2f200ff41f8887824ba70376fb5c39d1d8b04dff451936050b1e408642d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102E1 10900 bytes

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