Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0cf1d03cd3f88f7…

MALICIOUS

PDF

103.4 KB Created: 2021-03-14 05:25:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 517c50e986596a3a1abc50930e64e604 SHA-1: c2d4e19c8424a94c0a80d702fc5736c9416569d6 SHA-256: b0cf1d03cd3f88f7a892a789f0b0ad95d0226ab58d8b3fb80d1ddf54a7f9ee46
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains multiple external URIs, including one pointing to 'maypoin.ru', which is likely a malicious redirection service. The document body, though heavily obfuscated, suggests a lure related to a book summary, a common social engineering tactic. No scripts were extracted, but the presence of numerous links and the overall detection suggest the PDF is designed to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 5

  • 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 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/strik?utm_term=the+magic+book+by+rhonda+byrne+summary PDF link annotation
    • https://cdn.sqhk.co/jevamivuvugi/PHAhjau/vector_robot_for_sale_nz.pdfIn PDF document text
    • http://wildboost.club/veni_creator_spiritus_taizen3s4i.pdfIn PDF document text
    • https://cdn.sqhk.co/porevugaz/iafYXji/komiwaketarenitigid.pdfIn PDF document text
    • http://lujedovijoluje.22web.org/nubogidufujoviviruvun.pdfIn PDF document text
    • http://susobokilodos.iblogger.org/12375087086.pdfIn PDF document text
    • http://kopalomara.iblogger.org/aristotle_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/pasepizut/jiaUVhb/94478729026.pdfIn PDF document text
    • http://genusadnlo.space/is_logic_a_good_daw39krc.pdfIn PDF document text
    • https://cdn.sqhk.co/bolomadu/he1hhjh/endometrial_cancer_guidelines.pdfIn PDF document text
    • https://go.bestbookbits.com/freepdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/0d1552c1-3c2c-448d-8e2d-286d902c2b58/sifakoxejav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fa18327-a3e5-4274-aecb-f6e4aeaf3b82/99407121191.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c4cd56a-b83e-4e8d-b45f-560e3b50866b/lapuwedarodegoki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0bdb29d-7cd6-4fc3-95e8-6c051d5e0ef3/nezilagewatutarite.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3dba3da3-3301-4e31-acd2-453b22ed9c68/why_do_my_legs_hurt_when_i_sleep_while_pregnant.pdfIn PDF document text
    • https://s3.amazonaws.com/jezekemunidup/video_bass_booster_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/755eff08-1b4e-4c51-bc74-3b008956f881/panda_express_allergen_menu_2021.pdfIn PDF document text
    • https://s3.amazonaws.com/rovuweraja/jasmine_unit_test_coverage_report.pdfIn PDF document text
    • http://petifogowiga.epizy.com/ascii_table_extended.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12b580c8-b8e4-4b1f-9076-d20464ac3c71/caracteristicas_principales_del_modo_de_produccion_de_la_comunidad_primitiva_esclavista.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ea25a88-682e-4df3-a695-aec98d33f143/shimano_b-100_mag.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12677 5376 bytes
SHA-256: bea174541043e7931e4e54549fe07db862ee1214667e2884f8774730096749c3
font_01_sfnt_off00013881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13881 3008 bytes
SHA-256: ea9063bca1dbd2d797172ffbb0bb234ccdc1aae056a99186d4dcd9615cb15fd4
font_02_sfnt_off00014534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14534 10772 bytes
SHA-256: 4d4cf5ae2bd819ba4ce3518fed6e44c2e1ef94472a0f0677aed32fbbec3d406a
font_03_sfnt_off00016a33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A33 16092 bytes
SHA-256: 39b2f4b99ee08965fd4836f89f628a00cde8346cb181131bba0308e80db8fb67
font_04_sfnt_off00017efa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17EFA 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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