Malicious PDF — malware analysis report

Static analysis result for SHA-256 51e8f17cf895bac0…

MALICIOUS

PDF

77.9 KB Created: 2021-03-05 06:17:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: b3e9b5d70e010c8d98e1b1dbb58471a8 SHA-1: 43af38479311b9ae35372e163d7131fdb562a71e SHA-256: 51e8f17cf895bac048f2af1dc775d403974a4fc1a1d69d06f50ff5fa15fe1ec0
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a phishing or trojan delivery intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://maypoin.ru/123?utm_term=maguire+et+al PDF link annotation
    • http://thelandofbadideas.com/barrons_gre_book_latest_edition_free_downloadkjdtu.pdfIn PDF document text
    • http://dektesheff.xyz/que_son_los_verbos_regulares_e_irregulares_en_inglesof19z.pdfIn PDF document text
    • http://yblda.fun/diversity_visa_lottery_2021c3eww.pdfIn PDF document text
    • https://cdn.sqhk.co/raxoxawupej/uHidfjb/star_wars_dark_legends_target_exclusive.pdfIn PDF document text
    • http://groshyk.site/2107198000553wvh.pdfIn PDF document text
    • https://cdn.sqhk.co/sevijeruba/loib5G5/siboxijunadimiravo.pdfIn PDF document text
    • https://cdn.sqhk.co/fuluzagile/ehehdhc/exploding_kittens_nope_multiple_attack_cards.pdfIn PDF document text
    • http://esclick.pro/xidukirm5ko.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://748e6e98-33e2-4bd1-95aa-01ea3505a154.filesusr.com/ugd/704f6c_8bab210c10694f5bb95baf91ba834a9d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nupotukig/jarezixobovak.pdfIn PDF document text
    • https://26577e91-18e8-42c3-8e85-49dcca1d6605.filesusr.com/ugd/195787_f89c32329e5f4c0fbc2b784ab0502bdc.pdf?index=trueIn PDF document text
    • https://61069a5e-3c5f-4884-a3c7-8c7552058b74.filesusr.com/ugd/0789d5_3e4a520790c64161af10aa63d6691995.pdf?index=trueIn PDF document text
    • https://e8c82854-2a0b-4c0f-82de-bac600ce06e6.filesusr.com/ugd/d017d5_5319e95749de42659089181e66a9ac2c.pdf?index=trueIn PDF document text
    • https://033a7475-7ccb-45c1-8f1e-38fd320d48d0.filesusr.com/ugd/03a576_adcfdb96fa6b47c0a06126fc15ffb672.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lewuli/xiguripimab.pdfIn PDF document text
    • https://a49aa754-465e-4bbd-924e-b3d0e7b66bd4.filesusr.com/ugd/81d6a4_2ea4e470231b46f18b2110a35417a6d5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lerezazo/66919866598.pdfIn PDF document text
    • https://e02212b7-c8ec-4bf5-ba3e-d68a1de675e0.filesusr.com/ugd/7f1d73_d2d661b1048c4952894f1d2a92d32eae.pdf?index=trueIn PDF document text
    • https://e942959e-95af-4115-ab05-a6e38533eaad.filesusr.com/ugd/66f7a0_5a2356f1531949c9b55455fe79e3c3cb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/marimejerebo/8129327321.pdfIn PDF document text
    • https://170a7d3c-74f0-42f5-9ead-98ae292a4922.filesusr.com/ugd/a18aa6_8d92bdefe73b44efa388c4b94b95085e.pdf?index=trueIn PDF document text
    • https://254b3b0b-79dc-4992-827c-fd4bb3db3178.filesusr.com/ugd/f515ca_b66b86fe606c47abb207cacf5fa0af72.pdf?index=trueIn PDF document text
    • https://37bdae34-bb2f-403f-997c-54a7c09d9c06.filesusr.com/ugd/dc98cc_7cf47c6267b14eae8b88e555df3fd782.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/varoximu/filmorago_for_pc_windows_10.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_off0000f3ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AC 4680 bytes
SHA-256: 68779fbab467046eb09169c69093c3e45a4c819d8033b9056c935838a2dac1fd
font_01_sfnt_off000103ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AE 11452 bytes
SHA-256: 16134ae9d34f1f2e3a7bf8c2176c6d9b5046af8c55a6159931e03c04f5964871

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