Malicious PDF — malware analysis report

Static analysis result for SHA-256 daa6a50466922d29…

MALICIOUS

PDF

103.7 KB Created: 2021-03-17 05:35:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a3b32e3c55649c4dfe14b386c0e6219e SHA-1: 9925435047362fdec4e014979577b493d9edd7fe SHA-256: daa6a50466922d2973e1b568eb1767e6822443076a08757521c17eaee0806086
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting it functions as a link farm, potentially for SEO manipulation or to direct users to phishing sites. The presence of embedded URLs and the PDF's structure strongly suggest it is designed to redirect users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

Heuristics 6

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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/123?utm_term=lacquered+brass+sheets
    • https://cdn-cms.f-static.net/uploads/4477162/normal_5fd8dc557072f.pdf
    • http://sekelenogake.getenjoyment.net/what_is_marxist_criticism.pdf
    • https://panikelixiguju.weebly.com/uploads/1/3/4/4/134478359/rezubagejinogu.pdf
    • https://woxudozu.weebly.com/uploads/1/3/6/0/136042517/8796968.pdf
    • https://kirofiwesufeziw.weebly.com/uploads/1/3/4/8/134846910/xuzogux-joxodam-duzumalo.pdf
    • http://pexawegowe.mywebcommunity.org/belt_and_road_comic_book.pdf
    • https://lawagupavuraxap.weebly.com/uploads/1/3/4/6/134616311/gowajepa_faxexazaveli_zegaguxezem_vadepukanifon.pdf
    • https://wixinuwexe.weebly.com/uploads/1/3/0/7/130739185/37fcf6.pdf
    • http://giwapozolaleg.mypressonline.com/honda_gcv160_parts_breakdown.pdf
    • https://cdn-cms.f-static.net/uploads/4410976/normal_604ec6be763ea.pdf
    • https://cdn-cms.f-static.net/uploads/4493550/normal_601e5674b2d39.pdf
    • https://cdn.sqhk.co/wibononuve/higcihn/dinosaur_phone_wallpaper_download.pdf
    • https://tugovupovo.weebly.com/uploads/1/3/1/3/131380456/b8bb3d117e0.pdf
    • https://cdn.sqhk.co/woteruzid/jgjh3ia/15107181689.pdf
    • https://cdn-cms.f-static.net/uploads/4491412/normal_604eeeba89229.pdf
    • https://cdn.sqhk.co/xugikokazo/erM3Hji/pointers_basketball_aau.pdf
    • https://cdn-cms.f-static.net/uploads/4374188/normal_603a605ee0b32.pdf
    • http://bafedudovodamo.medianewsonline.com/monokilorokalovarawetapu.pdf
    • https://nifudosuv.weebly.com/uploads/1/3/4/0/134040563/keveratafajawumiker.pdf
    • https://cdn.sqhk.co/bogijifaviba/gegdjbv/22643957886.pdf
    • https://cdn.sqhk.co/boxepupovemu/ifW2gck/dance_hits_90s_uk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kigagizotag.onlinewebshop.net/gatikopifafowujib.pdf
    • https://f39f7cea-6337-46de-af4f-699959e6db0a.filesusr.com/ugd/004672_898d0b91e8b749cf843b03c7ba2f157e.pdf?index=true
    • https://1c437d0a-cccb-4a8a-93f1-39e0b5126915.filesusr.com/ugd/b91566_3d76f30c6cc14e36add2017eee951967.pdf?index=true
    • https://058da8ce-bb30-4b8c-81eb-8903018cac65.filesusr.com/ugd/ab745b_67c622603d2f48a9ad50b3b772ba2902.pdf?index=true
    • https://52a72965-a6d2-471e-b66a-59a59a4d663b.filesusr.com/ugd/e643da_d94373a95552475db714c705e78eebff.pdf?index=true
    • 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_off000155ed.bin
d5d86c9ccb481f4475652259466ed93a499f2d430f548c27e3f5044508b074c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x155ED 5204 bytes
font_01_sfnt_off0001678c.bin
18f89957071202f158e4e72dbac95d55ff3cf0639a340181d88b04676ddcddb0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1678C 12408 bytes

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