Malicious PDF — malware analysis report

Static analysis result for SHA-256 9abb1872ebe888e3…

MALICIOUS

PDF

77.1 KB Created: 2021-06-05 02:08:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a0e2d1808a1ded6421142cae0e5d65d0 SHA-1: c17335d05066405b94840091bd4dc2f14f7029d0 SHA-256: 9abb1872ebe888e3d185fb9dc7d4f698cbf239c2f5481663ab0d446ca099d469
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to link farms and disposable hosting, suggesting a phishing or SEO manipulation scheme. The presence of external URIs and the 'link farm' heuristic strongly indicate an attempt to direct users to potentially harmful content or to manipulate search engine rankings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://garglob.ru/pbw?utm_term=insights+test+series+2021+pdf+free+download+in+hindi PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4497093/normal_603377a0b5425.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476429/normal_6060a29459c0a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383445/normal_603c721291b39.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://puzavofan.pbworks.com/f/pemuxosujugamef.pdfIn PDF document text
    • http://vogituvu.pbworks.com/w/file/fetch/144603120/90191483122.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00a2e962-9d07-4525-9cfb-3c3e8ed9780f/newapetalakijakawotug.pdfIn PDF document text
    • http://palixazoke.pbworks.com/w/file/fetch/144571776/what_are_the_2_types_of_coffee_beans.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/249a5017-ee6a-4a16-b5aa-006b0aee938d/vergleich_lumix_fz1000_ii_und_fz2000.pdfIn PDF document text
    • http://xuwedateredu.pbworks.com/f/pisewosewimivalosuxobav.pdfIn PDF document text
    • http://kufujibumufa.pbworks.com/f/8970029884.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4dcf7e64-9f34-4c9c-a122-da6f97472a4d/kutisujatazakasawidekise.pdfIn PDF document text
    • http://funuvutidip.pbworks.com/f/dominion_energy_south_carolina_careers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e046c89c-8cfd-4dd8-ad59-6c5ddcdf1007/what_type_of_pool_heater_is_best.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87205adc-2405-4644-8dcd-eec1d3e98534/vexugijupatemonotapozid.pdfIn PDF document text
    • http://memofemovo.pbworks.com/w/file/fetch/144445434/94939191587.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b887e1a1-55a3-4e26-8a02-29867e0898e8/dungeons__dragons_core_rulebook_monster_manual.pdfIn PDF document text
    • http://kimotamiju.pbworks.com/w/file/fetch/144527934/53955442391.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8820ea98-dec6-4785-8eb2-c43d062f0fe6/does_the_bible_have_contradictions_quora.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c3621cf-206b-4622-834c-cfd352d6e9bf/can_other_babies_tell_if_youre_pregnant.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c6839f5-33c0-4264-8253-c4a280bd62bd/nabudonoluparuwidikete.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c99aace0-71e2-4412-8cce-574cfe232397/robapegazuderezaf.pdfIn PDF document text
    • http://buluwogot.pbworks.com/w/file/fetch/144603846/comment_enlever_sa_calculatrice_du_mode_examen_ti_82_advanced.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be3797f7-cb22-4e9d-8925-7317a3b1f47b/58330177603.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE259 3032 bytes
SHA-256: 23bd3afbf4f2551fc9dff4a3cb6cba3ddd8d5057ee11790fe9eeb2ced98c8d46
font_01_sfnt_off0000ed30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED30 5656 bytes
SHA-256: a85d47672e6a69824d67930f884f19e376b4d69e842f0e178589be7f5e079a1e
font_02_sfnt_off00010088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10088 10868 bytes
SHA-256: ccbb057293730f8296ea34fa5b236d43d582d0696f66caaea1d6833971da2f8a