Malicious PDF — malware analysis report

Static analysis result for SHA-256 59bbdd82831d0f11…

MALICIOUS

PDF

86.7 KB Created: 2021-04-13 09:10:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 3e06d54fb084b97c5e77710074869354 SHA-1: 69c4167701cdd073ee27ca0995248618d9aa8df0 SHA-256: 59bbdd82831d0f11b2ba200431477b6683f79677b2810e9615d6862bda0a800c
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The document body, though heavily obfuscated, contains text related to 'Gta iv complete installation release date check', which appears to be a lure to attract users searching for this topic. No scripts were extracted, but the PDF structure and numerous external links point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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 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://jacksth.ru/strik?utm_term=gta+iv+complete+installation+release+date+check+problem+solved PDF link annotation
    • http://wotaxatumumodok.sportsontheweb.net/zusan.pdfIn PDF document text
    • http://molapeda.iblogger.org/rendezvous_with_rama_free.pdfIn PDF document text
    • http://tapidiv.medianewsonline.com/cancun_hotel_zone_map.pdfIn PDF document text
    • http://midikakuvekume.mywebcommunity.org/45648527489.pdfIn PDF document text
    • http://migasoloraluxuj.scienceontheweb.net/simafolano.pdfIn 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
    • http://jiforexawa.rf.gd/14100466234.pdfIn PDF document text
    • https://54d25d35-1219-4e5f-97c3-905e72ea606f.filesusr.com/ugd/6d59ab_c98db34965a94c23a67a8e8db12c4ecb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bf16d7e-8d33-43cb-b737-9520523cdc82/90882238925.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0caefb6-ecf5-4b4e-ad73-f35f024b0404/53606950118.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a9f9b9b-6110-441e-850c-77695c182c0e/24324615080.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6379916a-c85d-451f-91b2-60871bc2a6d3/92442413744.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/854d7687-331b-4779-9bdc-42a0d2ac806d/warlock_5e_hexblade_build.pdfIn PDF document text
    • https://700ceb37-22d2-47c5-9888-d858af679aee.filesusr.com/ugd/c345b0_4567087173ec47d39f1a2fbe2c61f1be.pdf?index=trueIn PDF document text
    • http://kisomelug.rf.gd/diseo_y_comunicacion_visual_bruno_munari_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db3eaece-3cd1-46cd-bf70-1eca9c338795/insinkerator_garbage_disposal_installation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6be84d6c-c749-469c-b1e0-b0f51837f242/31278905801.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e4d08f7-97af-4765-82ea-7e0d4dd88894/flacc_pain_scale_for_neonates.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53b12088-7c5c-4362-870b-292f299c97ad/99860579794.pdfIn PDF document text
    • https://676a7a22-5bec-432e-92e0-9d4a0a27851c.filesusr.com/ugd/a1fb72_e9716d4fa4644448867f43b23a4fa6b2.pdf?index=trueIn PDF document text
    • https://0df22b04-17ae-4e65-9af8-3af4445b4601.filesusr.com/ugd/71fd01_cc9944aa619544c4a5738a58870bd646.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ff97f5a-624a-4b38-9b8a-bd3cc0f68959/22531061411.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfb7d3c5-4fb0-45b4-9270-759adc28dd16/how_to_remove_pimple_spots_on_face.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDD 5396 bytes
SHA-256: dbdc40d5c6c39efb5be259798be41e94d58306f4ccc4f95a90b5f5e51e879a48
font_01_sfnt_off00010003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10003 11376 bytes
SHA-256: 6f6c3510de4c8f5e5d0148db6447f3aa22582f99c91ced2db6175858aaef8c4d
font_02_sfnt_off0001274c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1274C 16096 bytes
SHA-256: 3bb08857b08983a257d5a2052628e18542fd51c8d29f5bbef87ea8b8ace00841
font_03_sfnt_off00013c15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C15 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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