Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecea66968132d8f8…

MALICIOUS

PDF

77.0 KB Created: 2021-06-05 05:21:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7f9ef901c55ab15c883865bdf9194a55 SHA-1: 348ab01b37bcd9f5e0b4d9158743116d678cdeb2 SHA-256: ecea66968132d8f82ae536a64a0d997014240aa7a9f775812dda2390d6c6d98b
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF documents, suggesting a link farm or SEO manipulation tactic. The primary URL, 'https://nomylo.ru/pbw?utm_term=spelling+practice+worksheets+grade+5', is likely a lure to direct users to a malicious site. While no scripts were explicitly extracted, the PDF structure and numerous external links, combined with ML and ClamAV detections, strongly indicate a malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nomylo.ru/pbw?utm_term=spelling+practice+worksheets+grade+5
    • https://cdn-cms.f-static.net/uploads/4489257/normal_603832a4c5701.pdf
    • https://xufaxasevejanog.weebly.com/uploads/1/3/4/8/134886042/8017313.pdf
    • https://static.s123-cdn-static.com/uploads/4420761/normal_600899e8a59a8.pdf
    • https://wimixexaselu.weebly.com/uploads/1/3/4/3/134324609/neboras_fulogiradox_romoregiwukeg_zarobava.pdf
    • https://cdn-cms.f-static.net/uploads/4414688/normal_5fd2398d5826a.pdf
    • https://static.s123-cdn-static.com/uploads/4485165/normal_5ff5fe782f29b.pdf
    • https://pokotozumunas.weebly.com/uploads/1/3/1/4/131453498/6869385.pdf
    • https://litaxavuve.weebly.com/uploads/1/3/4/8/134848922/jowusid.pdf
    • https://goruxevuretu.weebly.com/uploads/1/3/4/8/134851502/zurafegoparoli_nowel_nomakovivubov_womewuzixileper.pdf
    • https://gowapatemik.weebly.com/uploads/1/3/5/3/135319450/9102558.pdf
    • https://dibexawalezi.weebly.com/uploads/1/3/4/7/134760597/luburaxu-kinijelus.pdf
    • https://gutamigev.weebly.com/uploads/1/3/1/1/131163772/c12908a390ad2.pdf
    • https://gexemuxu.weebly.com/uploads/1/3/5/3/135394015/duvatapapagurifage.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sijomirurefi.pbworks.com/w/file/fetch/144620733/how_much_do_chief_administrative_officers_make.pdf
    • https://uploads.strikinglycdn.com/files/c69fc5b2-7965-48de-b4fa-ca4b3be11b97/vimox.pdf
    • https://uploads.strikinglycdn.com/files/27006902-a63b-4527-aabd-b58e1a3cf091/sideruvivikerifakotekavax.pdf
    • http://vefubop.pbworks.com/f/.pdf
    • http://gulisapil.pbworks.com/w/file/fetch/144420750/holley_carburetor_tuning.pdf
    • http://buxozodevoge.pbworks.com/w/file/fetch/144613299/garageband_apk_no_verification.pdf
    • http://risuxujuvu.pbworks.com/w/file/fetch/144627777/what_is_the_id_code_for_cradles.pdf
    • http://tuvovazuvezo.pbworks.com/w/file/fetch/144630762/the_mighty_ducks_game_changers_episode_guide.pdf
    • http://ropotupi.pbworks.com/f/govinuminabotifigofifotef.pdf
    • http://muzupusap.pbworks.com/w/file/fetch/144596496/age_of_empires_4_download_serial_key.pdf
    • https://uploads.strikinglycdn.com/files/f40b387d-0f6f-4be1-b440-5d883017bfbb/brother_hl_3170cdw_driver.pdf
    • http://molitutolu.pbworks.com/w/file/fetch/144558933/where_to_watch_cheaper_by_the_dozen_2_online_free.pdf
    • http://kakexigodelo.pbworks.com/w/file/fetch/144545343/nimezagazusegonix.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_off0000eb57.bin
ae215c2492885750e502e7e40ccf27b1146428032b315695d03f170899c5a139		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB57 5720 bytes
font_01_sfnt_off0000fedd.bin
1751f5c5fde395fb34951204224a1bd58113f5f2aec4244be76062bccc6c8376		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDD 12236 bytes

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