Malicious PDF — malware analysis report

Static analysis result for SHA-256 e740c6659f17221c…

MALICIOUS

PDF

81.5 KB Created: 2021-04-05 08:51:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: c40606ea9a8fed5eb57051710a275523 SHA-1: b9f8b029b56a0a90465c418e0177795de2c1b555 SHA-256: e740c6659f17221c8370750b733728aaac2e7366ae48c51036831db19bcc11ba
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic to distribute malicious content. The embedded document body text, though corrupted, contains keywords related to a PDF document, likely a lure.

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://jottigo.ru/award?keyword=the+socionomic+theory+of+finance+robert+prechter+pdf PDF link annotation
    • https://wezedamuj.weebly.com/uploads/1/3/4/4/134480618/714417.pdfIn PDF document text
    • http://xafopawiki.medianewsonline.com/65819170552.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462736/normal_60128755bf53d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488102/normal_5fd07a4bae595.pdfIn PDF document text
    • https://zexebofefibem.weebly.com/uploads/1/3/5/3/135303963/5976767.pdfIn PDF document text
    • http://jedilinosur.mywebcommunity.org/xafeb.pdfIn PDF document text
    • https://mubuzetuwifo.weebly.com/uploads/1/3/4/7/134703000/wodeves-pidiwakoxudit.pdfIn PDF document text
    • https://diwowure.weebly.com/uploads/1/3/4/5/134592565/puxuwilezaf.pdfIn PDF document text
    • https://gopojobazisedi.weebly.com/uploads/1/3/1/4/131436977/6336780.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6fc76513-a17a-4053-940d-bef108f5ea85.filesusr.com/ugd/3a5ef0_526d1d1575384c10b965123ed610025f.pdf?index=trueIn PDF document text
    • http://lisunamubeso.epizy.com/fokujefiwewox.pdfIn PDF document text
    • http://vakalugofiw.rf.gd/power_pressure_cooker_xl_red_potatoes.pdfIn PDF document text
    • https://882e4f53-a7e1-4d4a-89e8-a6e6d9f9b805.filesusr.com/ugd/9a13d2_7803ccf5054e400fb46b8dd4792dcde5.pdf?index=trueIn PDF document text
    • https://d1ee23ee-9ccf-45b0-80ef-1e1ff1f657c4.filesusr.com/ugd/9ef0c3_98a1401b9e3744c5b363fa85ddf143aa.pdf?index=trueIn PDF document text
    • https://8de17e8c-b43d-4143-985d-773a0aa332b1.filesusr.com/ugd/01f6ad_d8623f834c0e41e494c7bb554bc3c9ff.pdf?index=trueIn PDF document text
    • https://6e37e838-c278-4d46-baa9-25b8497af200.filesusr.com/ugd/fbcb80_d7bb7ec87bfa4a56864daa76097bf0d0.pdf?index=trueIn PDF document text
    • https://88bec3ce-9cdd-4818-a95b-bcf8ac49d1e7.filesusr.com/ugd/72df48_a9e4c03270b341dfb7049a6c52773672.pdf?index=trueIn PDF document text
    • http://lasikisitikuve.epizy.com/poridukajupuribilew.pdfIn PDF document text
    • http://muvamubas.atwebpages.com/bufawivoworebilekego.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CC 5552 bytes
SHA-256: 5b2da1ac3e322baa614a1c919899643b2515ffdee32eae9f3fcc1b0237a0bd24
font_01_sfnt_off00011382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11382 10764 bytes
SHA-256: ff5e582bd676c5b679d2ff0e1ae33a05b3b7128fb1115540543a041c6167c4d5

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