Malicious PDF — malware analysis report

Static analysis result for SHA-256 ade2a771d920b120…

MALICIOUS

PDF

110.7 KB Created: 2021-02-28 22:31:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 14cb3afa1b8eecadbb46b40f3adceb56 SHA-1: f7b066949ed52941162d7d55f1148fdcb9192435 SHA-256: ade2a771d920b120eb13e500135cc006eb273f8fe31ed40ad16901a9b9eadc8c
134 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://leonvi.ru/wix?keyword=15+4+practice+problems+continued+answers PDF link annotation
    • https://cdn.sqhk.co/gixixutiji/Xjjsluf/jubezovebudumilakewe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469623/normal_6023e0826239e.pdfIn PDF document text
    • https://tugofemupufere.weebly.com/uploads/1/3/4/5/134584107/jisopadetemomu-popir-lirexupugubirov.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409092/normal_6024bb14b8210.pdfIn PDF document text
    • http://viniveba.mywebcommunity.org/75005093121.pdfIn PDF document text
    • http://just-gopro.com/vawujiposetosexfa5yg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464521/normal_5ff55067468d7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452193/normal_5fd099c65a5d0.pdfIn PDF document text
    • https://lefilima.weebly.com/uploads/1/3/0/7/130775934/9679510.pdfIn PDF document text
    • http://morpeoplelife.ru/lofolarixugo45rz9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381752/normal_5fd77ac2f2c26.pdfIn PDF document text
    • http://wisecredit.info/alphabet_francais_exercices7muvi.pdfIn PDF document text
    • https://manesufepal.weebly.com/uploads/1/3/1/3/131381078/9207301.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/retobifulipo/dearman_give_fast_worksheet.pdfIn PDF document text
    • http://zesafemumibow.myartsonline.com/guxataveduremuvikux.pdfIn PDF document text
    • https://s3.amazonaws.com/xupovobejanam/medical_applications_of_laser.pdfIn PDF document text
    • http://petojijoxura.onlinewebshop.net/35607644524.pdfIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016a23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A23 1684 bytes
SHA-256: 4d3fb6748bdbfc0676bbc246a341b567ec3707c335db72ae26270b639488ab50
font_01_sfnt_off00017287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17287 5620 bytes
SHA-256: 953958bf00476e9daf2538291263f9eb6a9e9da31de40b0ddc0b1876840028cc
font_02_sfnt_off0001859e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1859E 11644 bytes
SHA-256: db73ed74dfdcac8f1a06533ded450e04c970e61473b91ff300c8deeef08a8e50

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