Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8d7c58a111d365a…

MALICIOUS

PDF

78.9 KB Created: 2021-03-15 13:28:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 5338f2c666baf410c0acf085d0223432 SHA-1: b1bd5989fd6df8b9b3b9c4ffd3179fa992d1b934 SHA-256: b8d7c58a111d365a8dbfc9fa9cbee7c00539a008ff89dd215a25d1ca9fd8418d
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 0.9996

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://xezojetit.ru/wix?keyword=the+integumentary+system+part+1+-+skin+deep+crash+worksheet+answers PDF link annotation
    • http://trells.space/how_to_change_a_hot_water_heater_element_without_draining6rb0y.pdfIn PDF document text
    • https://cdn.sqhk.co/fivukidado/IrjjEgd/kejepezalagubozedarebibe.pdfIn PDF document text
    • http://apkweb.net/28351385456smsq6.pdfIn PDF document text
    • http://nout-sale.site/wooden_surfboard_plansik88g.pdfIn PDF document text
    • https://cdn.sqhk.co/nusuguponu/9WMyORs/vezev.pdfIn PDF document text
    • https://tizupimarijifik.weebly.com/uploads/1/3/1/6/131606002/visuki_pebibedi_pujox.pdfIn PDF document text
    • https://cdn.sqhk.co/xitilesuxiw/jr3Mehf/planet_of_the_apes_1968_streaming.pdfIn PDF document text
    • https://sopunarexij.weebly.com/uploads/1/3/1/8/131857112/2694a25555eb8b5.pdfIn PDF document text
    • https://cdn.sqhk.co/lexelinowe/ikkhcib/lujozapi.pdfIn PDF document text
    • http://skidki-day.shop/kurorozaviqm1zg.pdfIn PDF document text
    • https://cdn.sqhk.co/seseniluvus/7gcEidJ/maganujopurumex.pdfIn PDF document text
    • http://italylife.pro/adj_nai_form7a5xt.pdfIn PDF document text
    • https://cdn.sqhk.co/vuveleni/i7icghh/bibag.pdfIn PDF document text
    • https://luwimejimidilen.weebly.com/uploads/1/3/4/0/134040945/5828346.pdfIn PDF document text
    • https://nutapezuzuf.weebly.com/uploads/1/3/0/9/130969421/da22f20.pdfIn PDF document text
    • https://kivobuduzuv.weebly.com/uploads/1/3/0/7/130739084/tupuful.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/wizakokowe/jatt_brand_new_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4094520c-08bf-4cbf-ae9e-832b0522e1b4/bimosa.pdfIn PDF document text
    • https://s3.amazonaws.com/kubafezin/as_1577.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb35b15f-8f19-46f6-9922-db1443b2fc6e/firovatumix.pdfIn PDF document text
    • https://s3.amazonaws.com/mamibis/7868086514.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_off0000f4d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D6 5748 bytes
SHA-256: 52b73c42aea9d971140fdfb600337924fdb02795f46b8fb69c8054a222a6c695
font_01_sfnt_off00010864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10864 10280 bytes
SHA-256: a361058a118ec23684c5919046fc773c874f402fdc683daeb922d43b797f8520

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