Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5bc2f17a654dbac…

MALICIOUS

PDF

79.0 KB Created: 2021-03-15 13:12:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 00a5b07add425c3cb2fc03e4e5c5c63a SHA-1: b65bba23173defe50fe110ed4fa892d4f5f9bd4a SHA-256: d5bc2f17a654dbac92dd0f25928fac9e8ef0f2848844cab9eac5e756a53863eb
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, with many pointing to disposable domains. This behavior is indicative of phishing or SEO manipulation tactics. The ClamAV detection and ML classifier further support its malicious nature. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content.

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://nipisod.ru/123?utm_term=beware+of+dogs+movie+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4458829/normal_5fd1f313bf5b7.pdfIn PDF document text
    • http://ionatr.space/92070103589bucg0.pdfIn PDF document text
    • http://allostar.buzz/wobevezumakejarigisiwozqtp6.pdfIn PDF document text
    • http://pokemonrivals.online/jasobegipogelcd5y.pdfIn PDF document text
    • http://jobware.pro/117849384328atar.pdfIn PDF document text
    • https://sivubatololux.weebly.com/uploads/1/3/4/8/134850937/6490671.pdfIn PDF document text
    • https://liganori.weebly.com/uploads/1/3/1/6/131637073/9b51bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414339/normal_6015dc7aa5276.pdfIn PDF document text
    • https://melegejisud.weebly.com/uploads/1/3/1/3/131379421/bunaniruxebabu.pdfIn PDF document text
    • http://flipping-car.online/49282865601sqpgz.pdfIn PDF document text
    • https://kabugumaka.weebly.com/uploads/1/3/6/0/136099465/334079.pdfIn PDF document text
    • http://itnegozio.info/mexaxutapajuzenakoziadsin.pdfIn PDF document text
    • http://shothard.site/amazon_kindle_paperwhite_manualtatkj.pdfIn PDF document text
    • http://all-gopro.com/55434398788p7eqc.pdfIn PDF document text
    • https://supavutoni.weebly.com/uploads/1/3/4/7/134713891/fixim.pdfIn PDF document text
    • https://fimulumalopa.weebly.com/uploads/1/3/5/3/135326017/3262191.pdfIn PDF document text
    • http://afracheat3.xyz/nunalikuderowiki15rnc.pdfIn PDF document text
    • https://jofanota.weebly.com/uploads/1/3/2/3/132302765/1f4d2a2badacf.pdfIn PDF document text
    • http://idealicaitaly-ufficiale.site/123musiq_tamil_free_download77ken.pdfIn PDF document text
    • https://vijopafixav.weebly.com/uploads/1/3/1/6/131636601/gamase.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bitumexupun.epizy.com/samsung_ua55d6000_specs.pdfIn PDF document text
    • http://mowumaja.epizy.com/pewilexitidawaxuwibemuged.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_off0000f69c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69C 5396 bytes
SHA-256: 45cf0f5c212adeedc21c281a5659aa43d632bd1a0bc175110953f2340bf6e3f1
font_01_sfnt_off00010901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10901 10888 bytes
SHA-256: 62d3bd07a3d9fb0354d7060cae38b1b6d7d3bf154b4195a631dc50429d4a48e0

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