Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d37d23480b53462…

MALICIOUS

PDF

84.4 KB Created: 2021-05-29 16:01:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: a551ba4bf2bdd23b188a6d292315652c SHA-1: d7e6030762bf5e5f5ec513fc5942d896af27f44d SHA-256: 2d37d23480b53462f3d5add00fe96013fc21e45206d48ed13af45d06ed309b7b
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and extensive URL usage are indicative of malicious activity, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://kuzutuzo.ru/123?utm_term=android+astrology+apps+free PDF link annotation
    • https://sekulawovow.weebly.com/uploads/1/3/4/5/134578441/9265719.pdfIn PDF document text
    • https://nowitijot.weebly.com/uploads/1/3/4/7/134716658/kuwimorusurofuzesana.pdfIn PDF document text
    • https://toxodapakaxoza.weebly.com/uploads/1/3/4/5/134525452/xiwen.pdfIn PDF document text
    • https://tabekobos.weebly.com/uploads/1/3/4/8/134869214/7a47e1851f74.pdfIn PDF document text
    • https://bekajujoxofutit.weebly.com/uploads/1/3/1/4/131406668/1db59262.pdfIn PDF document text
    • https://vujebitaj.weebly.com/uploads/1/3/4/7/134759162/jezinutibi_vuxelonavuma_jibufesubofe_zidituzofa.pdfIn PDF document text
    • https://vojufutevale.weebly.com/uploads/1/3/4/5/134521456/227a21f7f5b819.pdfIn PDF document text
    • https://dewotime.weebly.com/uploads/1/3/1/6/131606762/2df58bee1de.pdfIn PDF document text
    • https://danegatazi.weebly.com/uploads/1/3/0/7/130776269/rubase_xedobezujiz_gekuxenojadufu.pdfIn PDF document text
    • https://xovawezovikax.weebly.com/uploads/1/3/0/9/130969403/javemuzadavaxap-vomopaxatago.pdfIn PDF document text
    • https://jupuwova.weebly.com/uploads/1/3/1/4/131409597/5647978.pdfIn PDF document text
    • https://kebewizopega.weebly.com/uploads/1/3/4/6/134653356/7699468.pdfIn PDF document text
    • https://werotibumef.weebly.com/uploads/1/3/4/9/134900185/pisivegulevetab.pdfIn PDF document text
    • https://nukanepinax.weebly.com/uploads/1/3/1/4/131454046/5193397.pdfIn PDF document text
    • https://jobovivubip.weebly.com/uploads/1/3/5/3/135392816/tibotururer.pdfIn PDF document text
    • https://funovupudejo.weebly.com/uploads/1/3/4/4/134473131/b14ee5.pdfIn PDF document text
    • https://bunogijadijis.weebly.com/uploads/1/3/4/8/134896562/vovixibu-vudinejoleselek-wegobep.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/feebbc17-c27a-491b-9764-55286b64d5b8/gewonokijupepalekuvutitok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ef038d9-01fc-4061-a5ba-2563e3c6a54e/3290811680.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30ae5cad-a0b7-490a-b27b-c39cc0cb0345/8349650113.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42e8114c-075c-4d30-9f93-54047b410b02/xixipinenowetureva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bad2d76-3a5f-468c-999c-c5eb493eddbb/sony_cyber_shot_dsc_hx300_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0aeddc71-efc4-433d-b525-35d61e730b39/how_to_learn_basket_weaving.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb065e15-d33c-474c-bcf4-7a5940a118a8/91817741490.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/386feb17-a384-456d-bc79-5103eded78bd/29091754279.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40169e42-4eca-4a62-9af5-0d47fc2eaddf/73574556670.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f95e850-7291-4ff8-8ea9-ce6f96866c59/71014717968.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_off0000fee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE6 5088 bytes
SHA-256: 83f1f52afbdbc34f211e691b63c38d1007e8039f599abd7042d08fd74c4109ab
font_01_sfnt_off00011044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11044 10992 bytes
SHA-256: 322d5e75fdcd41b4abe26de7d6010eb825b7a9376efc5cdb820cb1c75d8ec90f
font_02_sfnt_off000135ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135AB 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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