Malicious PDF — malware analysis report

Static analysis result for SHA-256 534811df1cc79442…

MALICIOUS

PDF

73.3 KB Created: 2021-06-03 19:37:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: a27e729e183489c29979cd2384f0f0ae SHA-1: 3f8ed2ceea8a2a913e41f4a3dde6fc09cd7ff001 SHA-256: 534811df1cc79442f5008a07f9f86a1eba96ff647c69a28e1bbc8d75e4fd94ab
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7771

Heuristics 5

  • 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
  • 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://irlanc.ru/pbw?utm_term=ionic+bonds+practice+worksheet+key PDF link annotation
    • https://wemawamirake.weebly.com/uploads/1/3/5/9/135959397/4099722.pdfIn PDF document text
    • https://zamidagotef.weebly.com/uploads/1/3/1/4/131453459/wulupap.pdfIn PDF document text
    • https://mibinataxufix.weebly.com/uploads/1/3/1/4/131438539/ronulumaxowasen.pdfIn PDF document text
    • https://linepofikoleku.weebly.com/uploads/1/3/4/4/134492010/zatuj_gobekum.pdfIn PDF document text
    • https://pojixaguwor.weebly.com/uploads/1/3/1/4/131453565/kaginux-suvife-somekot-fegagivufupawi.pdfIn PDF document text
    • https://vejurinunabesud.weebly.com/uploads/1/3/4/7/134705678/71ec2.pdfIn PDF document text
    • https://donurufeto.weebly.com/uploads/1/3/4/8/134898164/guwivijo_kejuzipifuvaga.pdfIn PDF document text
    • https://wadozivapo.weebly.com/uploads/1/3/4/5/134512268/b0851ed64.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gazumadu.pbworks.com/w/file/fetch/144558516/pdf_to_doc_zamzar.pdfIn PDF document text
    • http://bekivuxuga.pbworks.com/w/file/fetch/144424221/46586017032.pdfIn PDF document text
    • http://mudowomuxexo.pbworks.com/w/file/fetch/144424023/vikings_season_2_episode_1_reddit.pdfIn PDF document text
    • http://redelaw.pbworks.com/f/redegetotasolutejoziwenen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd2e8b19-d854-4278-bac6-81e846d552ab/new_acca_jobs_in_karachi_today.pdfIn PDF document text
    • http://wiwedano.pbworks.com/f/bypass_frp_samsung_s6_edge_plus_android_7.pdfIn PDF document text
    • http://zafasuvolo.pbworks.com/f/rademumezixeraxubibawapiv.pdfIn PDF document text
    • http://jajisaparev.pbworks.com/w/file/fetch/144418446/voxukufosegalaluzogitowet.pdfIn PDF document text
    • http://xovakovawup.pbworks.com/f/xivujazekizisefij.pdfIn PDF document text
    • http://jitilabajeko.pbworks.com/f/profile.dat_dls_19_hack_download_mediafre.pdfIn PDF document text
    • http://fatakalewene.pbworks.com/f/88352030608.pdfIn PDF document text
    • http://puzavofan.pbworks.com/f/wakadubojurewasirese.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51d17829-294b-4b98-b09d-fa0b6da74106/76561978672.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4661ca1d-35b6-4885-a2fb-d8aa95201877/21333630397.pdfIn 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_off0000efc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC0 5464 bytes
SHA-256: f3c05271c2e9a7e8250c144ccb9b509fe7ecb17ca04cb0feb0629e133c664529
font_01_sfnt_off00010261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10261 11152 bytes
SHA-256: 8d89b816e9a59cb972a2486db0874f410bafdc72d3c970e6659ca882e143141e

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