Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a510c00a1e2eb3e…

MALICIOUS

PDF

74.7 KB Created: 2021-03-22 11:14:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 23b6a2e2eff883f63612c4097b795454 SHA-1: 3f3b40a7929ce3570f4d03b25b59b32cc62f1515 SHA-256: 4a510c00a1e2eb3e8211dc05dfc564a2912acb96ef2278c250912f2e2b660e0b
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URIs, with a significant number pointing to disposable hosting and potentially malicious content. The primary attack pattern involves luring users to external sites via a phishing pretext, likely to deliver further payloads or conduct scams.

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://resalured.ru/aws?utm_term=lying+sam+harris+pdf PDF link annotation
    • https://nogulakotu.weebly.com/uploads/1/3/0/9/130969216/1670584.pdfIn PDF document text
    • https://cdn.sqhk.co/vilonunufuk/shbigdb/ice_cream_cake_flavors_baskin_robbins.pdfIn PDF document text
    • http://tersq.fun/paint_colour_catalogueu9ku7.pdfIn PDF document text
    • https://cdn.sqhk.co/volumusigu/jd1iejh/vajetipabikulubovenupewo.pdfIn PDF document text
    • http://kufafukedexepix.mygamesonline.org/22575193402.pdfIn PDF document text
    • http://localdesign.me/74579199209ccydl.pdfIn PDF document text
    • https://budekimezarusij.weebly.com/uploads/1/3/5/9/135964348/1f5b28200.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mafonevaverazux.atwebpages.com/bauhinia_vahlii.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f11bf49e-1c2c-4a58-ba96-f60df2540ce1/24537423972.pdfIn PDF document text
    • https://46d16763-6c5f-4e19-aa2c-3f4071fcbec2.filesusr.com/ugd/26f730_45daf0a2c5a64bc6ba0c93e5e13845c4.pdf?index=trueIn PDF document text
    • https://24218389-b518-4ca3-8548-65eaf758daa4.filesusr.com/ugd/c836c3_fcc250f0b7304b3a81f92dfceaf7515b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb016ee0-8b3c-401c-b9b2-b3ec0dcc5e22/california_real_estate_principles_15th_edition_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f94644b-e07c-43e6-8f55-fd5063e3883e/12055658659.pdfIn PDF document text
    • https://2489a575-72f7-492f-b117-28cfe4a4d2a3.filesusr.com/ugd/d81705_bbab2e8c2e28485cb9afffbbc4bb9285.pdf?index=trueIn PDF document text
    • https://5fb42ee6-a9be-400a-98f2-f9d4b9f720c8.filesusr.com/ugd/1813b3_9dda9b36beff4186abeeb273b01239c0.pdf?index=trueIn PDF document text
    • https://84daacc9-7e90-4c5d-b1ed-526950900c49.filesusr.com/ugd/73f3b0_f00e939715594f1a8f550573bfa28ed4.pdf?index=trueIn 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_off0000e540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE540 5468 bytes
SHA-256: 46692b51528dd42cfe9c1a12220db99ad34a23505f5ac431de2276fefe230a67
font_01_sfnt_off0000f7c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C2 11136 bytes
SHA-256: c610d8e0609f8a5b7a0d60376fd2f620a691925338e88975f5e70811a4985599

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