Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1bffa06885ecebc…

MALICIOUS

PDF

79.3 KB Created: 2021-03-09 16:43:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 74d78ba518df10fdd1db7e7ca7f0547a SHA-1: 3131367692e8280d15f94b48cd59901e4edde7bd SHA-256: b1bffa06885ecebce8eeccc55d799d213278fa273dd5fc18029035f56b04129b
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The primary URL, 'https://ponafet.ru/wix?keyword=vivint+doorbell+camera+installation+manual', is presented as a manual but likely leads to malicious content or phishing. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

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://ponafet.ru/wix?keyword=vivint+doorbell+camera+installation+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4470016/normal_6013ebee38384.pdfIn PDF document text
    • https://cdn.sqhk.co/rijuratin/psjggdG/powurugegifinijujunuxeviw.pdfIn PDF document text
    • https://bazuxenulasiv.weebly.com/uploads/1/3/0/7/130740357/lidazijis_budotutubub_nopupaw_bunanagugog.pdfIn PDF document text
    • https://vonenubu.weebly.com/uploads/1/3/5/9/135964133/eaf3c23fa.pdfIn PDF document text
    • https://jurisosisirebak.weebly.com/uploads/1/3/6/0/136086550/ff86d5e47.pdfIn PDF document text
    • https://cdn.sqhk.co/sadirorig/Rkhgghe/app_store_wish_list_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369901/normal_603cf5c436e84.pdfIn PDF document text
    • https://tedipoji.weebly.com/uploads/1/3/1/4/131408178/5067362.pdfIn PDF document text
    • https://sazunanu.weebly.com/uploads/1/3/4/5/134596286/7681137.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/sorogamat/kolkata_puja_guide_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61e948c7-717e-4210-b71b-7b3b83d4d3b3/zotawabuxitu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15246bae-1d7f-4228-be24-4d8583ab1592/44757726764.pdfIn PDF document text
    • https://s3.amazonaws.com/migivewuwe/dapiluwosemejaw.pdfIn PDF document text
    • https://5e1449e8-5ae4-4a15-bc7a-ee23795bc964.filesusr.com/ugd/3a34a5_184c31ea6d0e43969ea91f5e7eb97828.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7aa33c0-02d7-4d2d-b0cd-e48bbe68f3fe/noxanagurekan.pdfIn PDF document text
    • https://72cdfa97-b5fe-44cc-9aa9-3142b5aa642a.filesusr.com/ugd/ee32c9_82d0edd239ed4ce59b1e3f1820213078.pdf?index=trueIn PDF document text
    • https://5fdaa9e0-ad6d-443b-8779-beb8e45026dc.filesusr.com/ugd/05301a_c794e175f77e4d76ba50272dc6ee514b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kopisigapub/instagram_apk_mirror_ios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e979384e-3644-4f95-aa60-2091109ad0b9/71908233236.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_off0000f99d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99D 5248 bytes
SHA-256: cba400cbd540bdbcb7396e31ecab28ad665d9fa81a4400ab018e70a8364e49c9
font_01_sfnt_off00010b64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B64 10628 bytes
SHA-256: 2984f4439617f212507a91cfc6b83f7ac570e1523377e4c645528b43e6b0a7c5

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