Malicious PDF — malware analysis report

Static analysis result for SHA-256 51b3036aec492c96…

MALICIOUS

PDF

130.4 KB Created: 2021-04-19 09:01:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 2355158124e9127f8d9802470234da84 SHA-1: 820de16b2221c4af1911ba4eed93e6841a1a6a88 SHA-256: 51b3036aec492c967e8fd6ba5043e406a4abb7d40c6fb3fa93fef7ef96af7162
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/strik?utm_term=the+holy+quran+in+arabic+with+bangla+translation+pdf PDF link annotation
    • http://changepass.online/296207057220h80g.pdfIn PDF document text
    • http://raicen.com/4892299737obazn.pdfIn PDF document text
    • https://cdn.sqhk.co/tibakekavero/iifuRGk/livestream_studio_remote_camera_windows.pdfIn PDF document text
    • https://cdn.sqhk.co/vemegunir/jghihTJ/motorcycle_for_sale_by_owner_medford_oregon.pdfIn PDF document text
    • http://4gusevshop.website/how_to_become_a_good_christian_leaderga49m.pdfIn PDF document text
    • http://govnosiakxws.online/278074875555boge.pdfIn PDF document text
    • http://jadebey-x.com/kapef1slbu.pdfIn PDF document text
    • https://cdn.sqhk.co/ditetona/TKoBxg6/keviputokelagonowurud.pdfIn PDF document text
    • https://cdn.sqhk.co/wituruxa/jjhcdzS/26832889380.pdfIn PDF document text
    • https://cdn.sqhk.co/kanemili/cib3lij/42092395274.pdfIn PDF document text
    • https://cdn.sqhk.co/zisubiziwu/EshjXbp/97924716263.pdfIn PDF document text
    • http://talkme-news.info/4313895311yb6vt.pdfIn PDF document text
    • https://cdn.sqhk.co/xavonepez/UTdhjfn/steve_s_world_adventureland.pdfIn PDF document text
    • https://cdn.sqhk.co/dedesonor/gdeJX7l/supivafosuz.pdfIn PDF document text
    • http://belldiscount.ru/mamedusurubimom6imp7.pdfIn PDF document text
    • https://cdn.sqhk.co/parabeset/ahbNjtR/radio_terra_nova_fm_104._9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.indictrans.orgIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e0f82c5-d428-4199-868e-61397a0f4c1c/present_perfect_exercises_multiple_choice.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67f39a86-eb59-411e-8097-9e27c25976b8/rifixerezeruvupife.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bad79f2-10f6-4bf8-afaf-1e5c9840d68e/motorola_ht1250_antenna.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b41d5f6-2419-4181-8ba1-d6872d776896/how_many_covid_cases_in_scotland_today.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fb383e2-d354-4564-b4a6-78e8fb22e9da/chrysler_repair_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9fe99cc-cf8c-4f01-803b-8ef4fee3628a/bioengineering_fundamentals_2nd_edition_ebook.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0001d4c1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1D4C1 22012 bytes
SHA-256: b9d4fb4f36c0362cf60b441cd39a83a4600a79b211dd31e7384e53a54ce8817d
font_00_sfnt_off000173b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173B3 4624 bytes
SHA-256: 382defed583474862098a95e87fc9c19a42dd1231f86ea8ca3361344ac88caf8
font_01_sfnt_off000183de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x183DE 5828 bytes
SHA-256: be7c43f5dedeafe02ba49c30c0df7c3ad2ee8d6c23c065316ec1ab794c0e54d0
font_02_sfnt_off000197bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x197BB 4728 bytes
SHA-256: b4c63332af5218ba2dca6d8ff962b491871841ad5fcbcd155612a28a5a5ac52e
font_03_sfnt_off0001a6bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A6BB 16100 bytes
SHA-256: 67936ee816846cbb5125cdb5858d7655d83b8c8f3b9a426d37e036923e1b90d5