Malicious PDF — malware analysis report

Static analysis result for SHA-256 1661154456815b51…

MALICIOUS

PDF

109.1 KB Created: 2021-03-30 02:42:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 82eaf2d1cf6c1cb2bbcea0c5219c1044 SHA-1: 0b3eb5f26915f27c6da417b9442d72fc4c095d9d SHA-256: 1661154456815b5195e5bfec194134ada81a5e0b69dd4729c5389f4d2a2cde72
186 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, containing numerous external URIs pointing to various domains, some of which are disposable. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links 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://mezovuduw.ru/wix?keyword=el+avion+de+la+bella+durmiente+realismo+magico PDF link annotation
    • https://zajosozuxisofe.weebly.com/uploads/1/3/1/4/131407459/4017194.pdfIn PDF document text
    • https://sujofunipus.weebly.com/uploads/1/3/4/5/134502209/4dc51b237ca4.pdfIn PDF document text
    • http://moreprodukti.com/skywalker_10_foot_trampoline_reviews99zdu.pdfIn PDF document text
    • http://dle-tpl.site/61097555146shsb8.pdfIn PDF document text
    • http://winfreeiphone.xyz/sony_icd-ux533fb9dgm.pdfIn PDF document text
    • https://mukozuzaze.weebly.com/uploads/1/3/4/2/134265885/lepotewivodevat.pdfIn PDF document text
    • http://cashthe.ru/soxidabefilorakuziyflen.pdfIn PDF document text
    • http://fitness1.space/5978723254556ocv.pdfIn PDF document text
    • http://ver-alex.website/durewoz09f9f.pdfIn PDF document text
    • http://callup.today/29352485168g2dm5.pdfIn PDF document text
    • http://opencabinets.xyz/employment_authorization_card_renewal_formafnwt.pdfIn PDF document text
    • http://buytoday.cc/how_much_does_it_cost_to_have_a_car_alarm_installedm4djs.pdfIn PDF document text
    • http://tugrull.com/250969224624d44e.pdfIn PDF document text
    • http://brosbass.com/when_should_i_start_my_tomato_seeds_indoorsdyi4y.pdfIn PDF document text
    • https://kizinuraximi.weebly.com/uploads/1/3/4/4/134446503/kotimevulofobin.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lebigegapil.epizy.com/visorufuwobajiruzumogika.pdfIn PDF document text
    • https://ddc7b23b-31e5-4b5c-aaad-d3b7cef26861.filesusr.com/ugd/e506b8_dcf61568d3ca4323bc348d803f645b0b.pdf?index=trueIn PDF document text
    • http://suzurexitumafod.epizy.com/multisim_circuit_simulator.pdfIn PDF document text
    • http://kixixobaso.rf.gd/91038559333.pdfIn PDF document text
    • https://1a9cd40a-f0d6-44d4-a143-19288280ca2b.filesusr.com/ugd/7a13df_ce15c8cd652b4eb08fedb973aa4950c5.pdf?index=trueIn PDF document text
    • http://lajoxugulip.epizy.com/acute_and_chronic_renal_failure.pdfIn PDF document text
    • https://56a7be67-7dca-40da-a973-69ad719fb73b.filesusr.com/ugd/fedf23_e173b9dcfd194282a42b7ee5a68bb337.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_off000168f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168F0 5416 bytes
SHA-256: e5f923beb391f1672db0b72578604809f32c9407f6da0292459d792373cc9754
font_01_sfnt_off00017b4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B4E 12844 bytes
SHA-256: e9c85e1f0183da1c3b0ad31a1d5736ee0c0eb36663b94571d0e9f516a66de308

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