Malicious PDF — malware analysis report

Static analysis result for SHA-256 3402755c67b0ae69…

MALICIOUS

PDF

75.6 KB Created: 2021-03-31 03:32:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 7866a486f56681e01323fa13bba80455 SHA-1: 7e68006d0bdcbebad7851529cf15f03fff33581f SHA-256: 3402755c67b0ae69995984de0a5df4b8a63ec04c3cc1607224ea381ca9d202ad
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 0.9999

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/strik?utm_term=chicco+cortina+cx+travel+system+recall PDF link annotation
    • https://cdn.sqhk.co/sagitusat/lkYiCge/90979907685.pdfIn PDF document text
    • https://cdn.sqhk.co/karefesifolo/xgjhaAE/nodesurikavujo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420018/normal_5fdbbcb320bcf.pdfIn PDF document text
    • http://dokukuke.mypressonline.com/89426407383.pdfIn PDF document text
    • http://jakiduve.scienceontheweb.net/43537033827.pdfIn PDF document text
    • https://cdn.sqhk.co/joraxeneli/dgeedib/doom_2_online.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484632/normal_60202ca0d74f1.pdfIn PDF document text
    • https://cdn.sqhk.co/megopofe/YiiihU6/dinuzoganemaweme.pdfIn PDF document text
    • https://lukimozogu.weebly.com/uploads/1/3/4/6/134638062/bitixozovoritotanilu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489257/normal_600205f5db46e.pdfIn PDF document text
    • https://tuwozuzoleza.weebly.com/uploads/1/3/4/5/134509843/6665238.pdfIn PDF document text
    • https://cdn.sqhk.co/rikopekela/8RgjcLv/48986140011.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373517/normal_603547e2d4f9f.pdfIn PDF document text
    • http://duzusedolatepe.mypressonline.com/how_to_use_self_clean_on_my_samsung_washer.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vuliwisuwig/casio_wk-1630_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2877f3f1-1f8e-42d8-bace-ae562805fabf/99834246031.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df497ec0-7d33-4db1-9f5e-9bcf9f131fcd/boss_dr_880_driver.pdfIn PDF document text
    • https://s3.amazonaws.com/fusopoxipo/54655596538.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_off0000e7ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AE 5172 bytes
SHA-256: 8fdfaa5ea7b3b8b84415acc311cb86c399f2725c4459bc9506a1f97b8661ab02
font_01_sfnt_off0000f924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF924 11208 bytes
SHA-256: 4eaa9128205dcc41283fcc4a714a78bce21903e3774f84d53a0518133134de41

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