Malicious PDF — malware analysis report

Static analysis result for SHA-256 57ffc49d60990352…

MALICIOUS

PDF

66.8 KB Created: 2020-11-11 01:05:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 3ac1eb4d23e77202937a7a40218dd924 SHA-1: d1ba95231edfca35ef4c791c6c639891e60195ea SHA-256: 57ffc49d609903520280aa866f27d072d19ac11eb577e0d51c16dd2b94c2d4f9
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

Heuristics 5

  • 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.
  • 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://traffine.ru/strik?keyword=time+master+pro PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368493/normal_5f926cfb1f062.pdfIn PDF document text
    • https://pijezokonogoxa.weebly.com/uploads/1/3/4/3/134308979/vipifamaw-vajikuzinilafi-xumupofa-sowopabefuwojem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368479/normal_5f89a19af1a66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384149/normal_5f8cb408d795f.pdfIn PDF document text
    • https://gatofofuxiwiv.weebly.com/uploads/1/3/4/2/134265530/273bd3d.pdfIn PDF document text
    • https://miwilokak.weebly.com/uploads/1/3/4/3/134375457/depazol.pdfIn PDF document text
    • https://dadoxagowona.weebly.com/uploads/1/3/4/6/134677816/xazujofimumexiweki.pdfIn PDF document text
    • https://fojumotapikapig.weebly.com/uploads/1/3/4/3/134372119/9172172.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/susopuzupure/mulapiwivivoroxal.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/instrumen_survei_akreditasi_puskesmas_2016.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/320038e7-327f-40e1-98ed-328699c1ed1d/mikesixovevidixamal.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubifirigevi/73819912647.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d096290-d5ca-4072-a68a-7b59c911707f/josokutugoxebebiwodasura.pdfIn PDF document text
    • https://s3.amazonaws.com/tutapaxi/brandon_heath_give_me_your_eyes.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_off0000c8f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F2 4880 bytes
SHA-256: 07858ef9b49027ad18d1a1c73ea795c2ab9879bdf288a8ee82e317f1785e837e
font_01_sfnt_off0000d96f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96F 10944 bytes
SHA-256: e0de27ad8f1e421dcfd1889ab664242e89336b4f5c6718a3bb11596983efb270

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