Malicious PDF — malware analysis report

Static analysis result for SHA-256 87b35241d3b942b5…

MALICIOUS

PDF

78.2 KB Created: 2021-03-19 18:29:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1b3e3d91a364ebfe58b22503b3f52a1c SHA-1: 15a5715e433b17884b633bef51aca5ca94751e93 SHA-256: 87b35241d3b942b53c2e2a97cbcdce78123f5051e9dd162ea3bbaa4a7f25dd9b
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 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://midufefew.ru/aws?utm_term=will+there+ever+be+a+sequel+to+harry+potter PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4392220/normal_603ff60e0d573.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471096/normal_60413a2aa9426.pdfIn PDF document text
    • https://rudagaje.weebly.com/uploads/1/3/4/3/134310377/3776092.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367656/normal_5fd2447d5a25f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419630/normal_5ff78e8d8aeb2.pdfIn PDF document text
    • https://kovepezerolozu.weebly.com/uploads/1/3/1/4/131483153/2542060.pdfIn PDF document text
    • http://terugate.mypressonline.com/mixekap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421770/normal_604cf34a94695.pdfIn PDF document text
    • http://fotogodopuxet.iblogger.org/janapada_dj_songs_telugu_2019.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/2038f1d9-ffa3-462a-9219-c6cc6b4346b0/79108515356.pdfIn PDF document text
    • http://tavoxelelenasi.onlinewebshop.net/vabef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bf4ff9f-1be0-41c3-ba8a-a5c0bce05c72/raken.pdfIn PDF document text
    • http://zitulogakapede.myartsonline.com/familia_asteraceae_caracteristicas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/371908b3-6463-42ed-bec5-0239e0dbfb2a/how_to_play_m_audio_keystation_49e.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8eb9b7af-7925-400c-b729-c270968708c1/sharp_20l_microwave_oven_shp-r207ek_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e7c2850-3e29-446d-8862-72e8fc5e0591/pharmacology_calculations_made_easy.pdfIn PDF document text
    • http://gitipezusev.rf.gd/kamisidakokojepimewelose.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E7 5124 bytes
SHA-256: 7babaac6ddc12ab8734fb07bc297aeb0a762b5a6df94cbd6fb5be59d99f72951
font_01_sfnt_off0000f777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF777 11184 bytes
SHA-256: fd76a4cb0edabcb8410f2cd3dadb0aba1647f1aa6d0151cf0e38662c3d042f2d
font_02_sfnt_off00011d84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D84 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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