Malicious PDF — malware analysis report

Static analysis result for SHA-256 58612cf1e6afcd0c…

MALICIOUS

PDF

110.6 KB Created: 2021-03-20 16:36:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 22e893a22f76820eeb7e32f80c7ef93f SHA-1: 51507a26f431131a01663a82e7bc2ced15895fb4 SHA-256: 58612cf1e6afcd0c76bc31d4579f4fe0a8bcdcb25ea24fe846b07b2a8d1e6c9d
186 Risk Score

Malware Insights

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

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 0.9936

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://pelibifir.ru/award?keyword=britain+for+learners+of+english+oxford+pdf PDF link annotation
    • http://tipefumasozop.22web.org/84009758342.pdfIn PDF document text
    • https://xidelesa.weebly.com/uploads/1/3/4/4/134498911/wofokuginakizabe.pdfIn PDF document text
    • https://cdn.sqhk.co/wowasuperan/jd2igig/tepogapi.pdfIn PDF document text
    • https://vojutodebol.weebly.com/uploads/1/3/4/0/134096580/fapejanuragopavir.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371505/normal_5ffe81e3ae8fc.pdfIn PDF document text
    • https://cdn.sqhk.co/vekuzajomugi/cgjzS82/word_online_download_mac.pdfIn PDF document text
    • https://cdn.sqhk.co/levowexesu/igxge5a/thorogood_boots_moc_toe_review.pdfIn PDF document text
    • https://cdn.sqhk.co/wizokawoxo/bfxnqMd/tedizoropasapodobuxave.pdfIn PDF document text
    • http://porafav.iblogger.org/51952358474.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476595/normal_60433caef11ec.pdfIn PDF document text
    • https://dexajaxalujum.weebly.com/uploads/1/3/1/8/131857565/sibodixemofap-kizipinuw-matotak-wugafezud.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365560/normal_5fc95a502a410.pdfIn PDF document text
    • https://tapizijivuvol.weebly.com/uploads/1/3/2/6/132696465/7433981.pdfIn PDF document text
    • https://cdn.sqhk.co/rabataxuvax/idJiehb/regency_theaters_van_nuys_movie_times.pdfIn PDF document text
    • http://takovod.66ghz.com/97098421531.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gemexarugaxunop.rf.gd/astrology_books_for_beginners_free_download.pdfIn PDF document text
    • https://667abc8f-92ca-45d9-bc9d-789c80a68858.filesusr.com/ugd/dcd78f_d5981638797f45d7b840d32aaf18bb8f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sepawi/jamojojurijapapojiv.pdfIn PDF document text
    • https://s3.amazonaws.com/bokofapig/jozirudumuf.pdfIn PDF document text
    • https://47c0d0ed-94e3-447f-940a-e265262d053f.filesusr.com/ugd/a43ec6_965385e3857b46928e5750131b9387cf.pdf?index=trueIn PDF document text
    • http://zabepir.rf.gd/97222928957.pdfIn PDF document text
    • https://e82ff0bd-cb1a-4782-8b92-0a0fb7657660.filesusr.com/ugd/d17951_2234bb8cc7be41e79c363b8a864bf68e.pdf?index=trueIn PDF document text
    • https://a52dd608-e7dd-4d50-8005-e0fd7a3896b4.filesusr.com/ugd/43d2fc_70f0f053aa0f4428a47927d93f1b07a6.pdf?index=trueIn PDF document text
    • https://d04c2b29-3777-4fe6-aaa9-ab96f87c3324.filesusr.com/ugd/43eb95_c50887e9057c459484ec74bea07f21ec.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/muvarelo/rosewiwamabuja.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwosil/excel_vba_find_string_in_array.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_off00016b39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B39 1684 bytes
SHA-256: a8640cb23b15ac802f89dd0648c07b7ad030d8b62c5f78624c3814794ace58c4
font_01_sfnt_off0001739d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1739D 5420 bytes
SHA-256: 3ad2736c7e6dceb93cba8334c97235b675397d9c98967c17e0eebaffa571d5e6
font_02_sfnt_off00018610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18610 11160 bytes
SHA-256: 6ff6b0ceb93bb72316838dedbd3244724ba3e9af8182056a4707ac3834c060a1