Malicious PDF — malware analysis report

Static analysis result for SHA-256 27c11e493e971151…

MALICIOUS

PDF

113.4 KB Created: 2021-03-10 05:45:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 4bbb31db7ab93cd555f80c59df39dc4f SHA-1: 29e394395e55cf67c75c380d62bafd3280c5dee3 SHA-256: 27c11e493e971151d07f1426cef480f54f3363f9eee4bffe4fa31feecbb26615
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains a large number of external links, many of which are hosted on disposable domains, suggesting a link farm or phishing attempt. The primary URL, 'https://lozipotod.ru/strik?utm_term=what+are+the+essential+principles+of+communism', is presented as a search result, likely to trick users into clicking. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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://lozipotod.ru/strik?utm_term=what+are+the+essential+principles+of+communism PDF link annotation
    • http://bestsalestoday.xyz/bajirao_mastani_full_movie_with_english_subtitles_fmoviesi0jeo.pdfIn PDF document text
    • http://milesnires.xyz/gujevanusudubiwufi8zmc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418370/normal_60481ee521f7a.pdfIn PDF document text
    • http://vanlit.ru/87854174526clecj.pdfIn PDF document text
    • http://raisinslabs.club/crooked_kingdom_kaz_quotesyfclg.pdfIn PDF document text
    • http://fresh-ita.fun/what_is_the_safest_vanguard_money_market_fundsse37.pdfIn PDF document text
    • http://ryursew.space/aha_cpr_guidelines_2018x2uw0.pdfIn PDF document text
    • http://big-ita.space/ganemowix81ru7.pdfIn PDF document text
    • http://myluckybet.xyz/warrior_cats_spottedleafs_heartnlyut.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452618/normal_5fff7aa0bb8fc.pdfIn PDF document text
    • http://yellownatural.space/increasing_decreasing_and_constant_worksheet_key3mght.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474977/normal_600ce791167de.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465705/normal_5ff87ff094584.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421776/normal_5ff971b52f44b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d1ee23ee-9ccf-45b0-80ef-1e1ff1f657c4.filesusr.com/ugd/9ef0c3_ecf3c05b789d4b549033f359d2770a2d.pdf?index=trueIn PDF document text
    • https://0ef2f354-78a3-4528-990c-72f69c86fc6a.filesusr.com/ugd/6a0da6_e638fb98fff4409f931061e580f19608.pdf?index=trueIn PDF document text
    • https://c931c956-7f53-4e4e-96dc-27d7f003ba63.filesusr.com/ugd/b80c10_abb01fa6e8064a8ba1b3caf7185bfc39.pdf?index=trueIn PDF document text
    • https://78151a86-a557-4e49-81aa-a2539eea45c7.filesusr.com/ugd/204f4f_bad511af1b584b768915a57dcf68eb2e.pdf?index=trueIn PDF document text
    • https://ef5e9b3f-1a8e-4c79-9b60-34b8f8133c96.filesusr.com/ugd/18574e_2caed571c073438cba4b88dcccec18fc.pdf?index=trueIn PDF document text
    • https://32cf4326-ba62-484c-a3ca-05d02c2dd2e5.filesusr.com/ugd/0b46e6_064239ea32d44d3a9df9bb0f5887b6f1.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016b4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B4C 5268 bytes
SHA-256: 4ea4f2d263ea1bd8931a0cb1cfe3a1411d06397cc1c42cb33d31918aa6021d02
font_01_sfnt_off00017d1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D1B 10604 bytes
SHA-256: 896fd79ad38e55accb82eac119b137cb73df47eaf8ab2c009a68050daf5a9b9c
font_02_sfnt_off0001a17d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A17D 16300 bytes
SHA-256: 2d98f82cc17f1fe0178a7fb6d622d9841ae46c9a763d4f0b68f0629215edc9c0

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