Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf1a3f52e8eecb20…

MALICIOUS

PDF

120.8 KB Created: 2021-05-25 13:46:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5dbc798bc6db05a53b3f664b36648de8 SHA-1: 2d0e1bdc47c93bac09051224f4e4c86fad61655e SHA-256: bf1a3f52e8eecb20a65378ffa50b75c64335bf5b8712c978786edd18ce5629b3
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as phishing. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic confirm the attempt to direct users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/strik?utm_term=esv+archaeology+study+bible+pdf
    • https://dowixedazu.weebly.com/uploads/1/3/1/4/131409709/0cd0be651a0.pdf
    • https://kumakisatosoref.weebly.com/uploads/1/3/5/3/135328720/tuxupapebusedo.pdf
    • https://rujuzodojavumip.weebly.com/uploads/1/3/4/7/134726220/1afd7e789f9fa.pdf
    • https://zokukomusisitu.weebly.com/uploads/1/3/5/3/135323242/dajixugazaf.pdf
    • https://waperimawomexav.weebly.com/uploads/1/3/4/7/134733778/e4c81fb388160f7.pdf
    • https://kojelujozifani.weebly.com/uploads/1/3/1/8/131856125/3716113.pdf
    • https://zedodunojoponex.weebly.com/uploads/1/3/6/0/136083391/fakufugosoz-sadimowopag-pezazifomub.pdf
    • https://farumurul.weebly.com/uploads/1/3/5/3/135326432/9a8cd284674d.pdf
    • https://tupimala.weebly.com/uploads/1/3/4/9/134904604/pojikumuvuwata.pdf
    • https://xuwosanilenerev.weebly.com/uploads/1/3/4/9/134900173/75efeff.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sobaketemu/clariant_ag_annual_report.pdf
    • https://uploads.strikinglycdn.com/files/37c1d2d7-5c3b-4665-bbb8-eae6419c7525/nombre_de_los_hermanos_de_jess_en_la_biblia.pdf
    • https://uploads.strikinglycdn.com/files/a2c5d6fd-374b-402d-a22c-38a5ce673726/computer_problems_and_how_to_fix_them.pdf
    • https://uploads.strikinglycdn.com/files/e60b4e07-d202-4ee1-997d-03407b63899f/ripple_in_still_water.pdf
    • https://s3.amazonaws.com/sebunuzu/54962200582.pdf
    • https://uploads.strikinglycdn.com/files/b1e0927b-d2b9-41ea-a0ac-9e15f27fd817/vudebasoborapu.pdf
    • https://uploads.strikinglycdn.com/files/6588b54b-a378-49f8-bf7b-34cb66ad5b1c/dell_optiplex_760_drivers_win7.pdf
    • https://s3.amazonaws.com/kovibu/monster_antonyms_meaning.pdf
    • https://s3.amazonaws.com/padosumifubobo/zejavavodok.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019a78.bin
7cba07c6a53536634f736f1929c40186b9e460c43433e460160ff0f78e34c001		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19A78 5676 bytes
font_01_sfnt_off0001add2.bin
47b417642bbd72afb2c04662b1f1bb2360270224a8528d1c9d2a6dafcd8f27f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1ADD2 11892 bytes

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