Malicious PDF — malware analysis report

Static analysis result for SHA-256 9afd3dd44d9bf320…

MALICIOUS

PDF

74.9 KB Created: 2021-04-06 22:57:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3ac92a4bb4dcad9f3e5629b9c1037b26 SHA-1: 732eb996a9a72bf671e72e34909e0dabdd1e3153 SHA-256: 9afd3dd44d9bf3201bd9e3685d4872464365b45170d7d3d4eb186efe277212de
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/award?keyword=differential+amplifier+pdf PDF link annotation
    • https://cdn.sqhk.co/xamapetarel/TdLDAhf/89273948447.pdfIn PDF document text
    • http://najetaxu.mygamesonline.org/redaction_des_actes_administratifs.pdfIn PDF document text
    • http://pravagims.net/vekobozokipunuzibesogiljxya.pdfIn PDF document text
    • http://joweponula.mywebcommunity.org/66956781131.pdfIn PDF document text
    • https://cdn.sqhk.co/zojixemem/ieBhiha/lisadinikifadebiko.pdfIn PDF document text
    • http://boldly-grow.com/hcc_affirmation_of_residency_form_onlinej8pos.pdfIn PDF document text
    • https://cdn.sqhk.co/jekuzedu/gNheYPK/semo_espn_92._9_fm.pdfIn PDF document text
    • https://cdn.sqhk.co/juxerawabuf/M0giApc/download_permainan_sweet_fruit_candy.pdfIn PDF document text
    • http://trokot-online.xyz/reporter_gene_assays_meaning41c6y.pdfIn PDF document text
    • http://uscreditcheck.info/gelifiwetjt5e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://desuvusemexemob.epizy.com/lizemofubo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33c83bcb-bc53-42ef-95b8-532a2f045db5/15851279371.pdfIn PDF document text
    • http://bupagaruwizuzu.epizy.com/how_much_does_a_cochlear_nucleus_7_cost.pdfIn PDF document text
    • https://77a48bbd-706a-45f8-a225-ac1cc02029d7.filesusr.com/ugd/3be48b_0f1c84390b6943679204d91a34f809fd.pdf?index=trueIn PDF document text
    • http://gaxekexo.rf.gd/47950851864.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c885603e-3513-4629-92bd-d3f0991c145e/is_year_of_the_tiger_lucky_in_2020.pdfIn PDF document text
    • https://e57d8632-f742-4524-ada6-9cdf759d9f13.filesusr.com/ugd/b0cb2d_9319394f67c34cdebfe79b5e4426e130.pdf?index=trueIn PDF document text
    • https://737c154f-ca75-4484-807d-9d5c19d76377.filesusr.com/ugd/7e84b7_66dcd7ac151b4c66a79aee0b6439284b.pdf?index=trueIn 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_off0000e918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE918 5008 bytes
SHA-256: edbafd476ed69b1490bb9f858030c66501828eed3daf70f7840731749d65a0a8
font_01_sfnt_off0000fa10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA10 10676 bytes
SHA-256: 446615503165b78d70dfeac86dc1fed2d5a38963bcc809033e2aa91e46fad313

Open this report in the interactive analyzer, or submit your own file for analysis.