Malicious PDF — malware analysis report

Static analysis result for SHA-256 81fe23c09001a2f5…

MALICIOUS

PDF

81.2 KB Created: 2021-05-28 12:17:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 62170153934e082e4d2ec5439c3e99b4 SHA-1: c285e9ee42085a65c8a4709227c13c47eda64aff SHA-256: 81fe23c09001a2f5a7d6d1ec5eee5f3aa03641bd83654ec3bd354ab0458f4a3b
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable hosting services, suggesting a link farm designed to distribute malware or phish for credentials. The presence of a 'download' lure in the document body, combined with the ML classifier and ClamAV detection, strongly indicates malicious intent. The numerous external links and the nature of the URLs suggest an attempt to redirect users to malicious content or download further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://fokemale.ru/strik?utm_term=baldi%2527s+basics+plus+free+download+pc PDF link annotation
    • https://koledino.weebly.com/uploads/1/3/4/3/134332835/rafugifubeb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426269/normal_5ffd305287b83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365624/normal_6048fb22483ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403946/normal_6026604d59562.pdfIn PDF document text
    • https://rigavedisibabaz.weebly.com/uploads/1/3/4/9/134902328/5665260.pdfIn PDF document text
    • https://dumamawikop.weebly.com/uploads/1/3/0/7/130740251/karoduxevagifer.pdfIn PDF document text
    • https://zidimegaga.weebly.com/uploads/1/3/0/9/130969389/5960454.pdfIn PDF document text
    • https://gozofuma.weebly.com/uploads/1/3/0/8/130874065/zapidozoradur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469641/normal_600fbb3d767ed.pdfIn PDF document text
    • https://javofosuzuvenew.weebly.com/uploads/1/3/4/5/134588543/lidepuwijopeke.pdfIn PDF document text
    • https://jazelufum.weebly.com/uploads/1/3/5/9/135965355/milusipusewupilat.pdfIn PDF document text
    • https://zebepinexorusog.weebly.com/uploads/1/3/2/6/132695607/fefinat.pdfIn PDF document text
    • https://tenogamux.weebly.com/uploads/1/3/2/6/132681545/e853e717d9.pdfIn PDF document text
    • https://tinubuwetoka.weebly.com/uploads/1/3/5/3/135325034/sipis.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407810/normal_5ffb54f95c903.pdfIn PDF document text
    • https://xemaxokiba.weebly.com/uploads/1/3/4/3/134350412/6489151.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417406/normal_60062bfd9d42a.pdfIn PDF document text
    • https://wevubajapema.weebly.com/uploads/1/3/5/9/135958203/mevemenef_sokefalovi.pdfIn PDF document text
    • https://rowusebejaron.weebly.com/uploads/1/3/1/6/131637242/fajewojikudir_xajel.pdfIn PDF document text
    • https://sumomaduge.weebly.com/uploads/1/3/4/8/134884200/545c2a95d457.pdfIn PDF document text
    • https://sebaderibegagib.weebly.com/uploads/1/3/4/5/134583030/wowemozufa.pdfIn PDF document text
    • https://fokereja.weebly.com/uploads/1/3/1/8/131856005/8098565.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476146/normal_601ddac990f51.pdfIn PDF document text
    • https://tavimemake.weebly.com/uploads/1/3/7/5/137513296/giwefowewaba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412174/normal_5febe708d61e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484820/normal_603cc9b5f0a8e.pdfIn PDF document text
    • https://moginirem.weebly.com/uploads/1/3/4/7/134769545/2823794.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000fd6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6A 5464 bytes
SHA-256: aa337b0d285627c339d3e06fd60e38b5e1385701edb03c9c5843cbd4153962cb
font_01_sfnt_off00011023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11023 11348 bytes
SHA-256: 9b3b6adbe6f7ff627f99c770dd66ebcbe837aaa39cc2467cb1b6aebb78340275

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