Malicious PDF — malware analysis report

Static analysis result for SHA-256 a99576ba393ed86d…

MALICIOUS

PDF

79.8 KB Created: 2021-03-28 06:14:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 6c59f33de63f1029ac135af7343036b2 SHA-1: 8127ec83724b1a4d3ac08fb372f92651f5ac297f SHA-256: a99576ba393ed86db2cff690f79d1324a38bdcc0534336190b9584cc7f730fd9
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 0.9991

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://dugedepap.ru/123?utm_term=balada+para+elisa+partitura+piano+pdf+gratis PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4366055/normal_5fccffbf855ba.pdfIn PDF document text
    • https://kozenuxifojani.weebly.com/uploads/1/3/4/6/134665776/vopuna-riwefawo-zafajidotipo-dixamox.pdfIn PDF document text
    • http://rivezetufizi.iblogger.org/43245518885.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384046/normal_602fc8bf671a7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457847/normal_5fce924db2b78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423155/normal_603f5eaf69eb0.pdfIn PDF document text
    • https://soliduratop.weebly.com/uploads/1/3/2/3/132303261/9406860398a6c.pdfIn PDF document text
    • https://kefagifugujog.weebly.com/uploads/1/3/0/8/130813645/bulunoje.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409411/normal_601a62c520913.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449014/normal_600e5db699858.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444115/normal_5fee0e874fc8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368488/normal_600dc4b4e0fba.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
    • https://uploads.strikinglycdn.com/files/19d7eb80-3444-4a16-b5bc-018a8c44f635/85828874249.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/865c2027-72c0-42ff-8be1-9070967fddb5/do_tires_go_on_sale_on_black_friday.pdfIn PDF document text
    • http://tuguxukoz.epizy.com/wenojudawevogaf.pdfIn PDF document text
    • https://c3f0ce02-b953-40d9-b94a-e38a054f9a35.filesusr.com/ugd/7afb62_35331dcf0c894540b7f922c7a732a70e.pdf?index=trueIn PDF document text
    • https://e25b7b56-d8f7-44cb-9276-56428e53d1cc.filesusr.com/ugd/63f3e8_2e98c333301a4f1fb96051525e19da3f.pdf?index=trueIn PDF document text
    • http://ketugida.rf.gd/posterior_knee_pain_exercises.pdfIn PDF document text
    • https://94226b1b-8363-4ad6-a779-e61b7b16ff5b.filesusr.com/ugd/b3bc21_c46cd0741dd64243b3ea9a0fdc52ef1f.pdf?index=trueIn PDF document text
    • http://viwokapexonilef.rf.gd/8374069724.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f234f617-aa2a-42c9-bf02-684776c7d1c4/how_to_fill_ultrasonic_humidifier.pdfIn PDF document text
    • https://9e084d23-5bbf-42ad-98e9-fa9200f8584e.filesusr.com/ugd/4f663b_f9872ff5fadb4718bb5c795d98a87c00.pdf?index=trueIn PDF document text
    • https://a84030a7-2e48-4039-807a-383e2b7216cc.filesusr.com/ugd/c5d40f_20d6b61552b343edb65c9c851da3d6c4.pdf?index=trueIn 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_off0000e9b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B4 5140 bytes
SHA-256: 0e63a3287f6f0fb34e8cd1b3b1a1e2d0708c6251a6dd5aacffa4cb3e3ca51bff
font_01_sfnt_off0000fb3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3A 11756 bytes
SHA-256: 75f5b90d2370e86301fc44d6d1c264ae38ef7023d6c49f1c07fdf5767e8527ef
font_02_sfnt_off00012183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12183 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71