Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6880cd77e67bce2…

MALICIOUS

PDF

77.9 KB Created: 2021-04-06 14:09:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 7b35129172659243738192ac21d4936f SHA-1: ed63b1421057d158a80180087ded23a0ef81e49b SHA-256: a6880cd77e67bce275d89e6ff3ed660a6e7d6a0c7414cd0ff061c6bbdf85cb1e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9995

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://fokemale.ru/123?utm_term=free+monthly+attendance+sheet+template PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4386613/normal_5fffc54b743c7.pdfIn PDF document text
    • https://gajifawegux.weebly.com/uploads/1/3/4/6/134649352/2305952d92fee44.pdfIn PDF document text
    • https://nagiliju.weebly.com/uploads/1/3/1/4/131412426/vapup.pdfIn PDF document text
    • http://varuvoruva.iblogger.org/12th_date_sheet_2020_cbse.pdfIn PDF document text
    • http://meweremidef.iblogger.org/vovadisidolugeloku.pdfIn PDF document text
    • https://ruzuwigowan.weebly.com/uploads/1/3/1/4/131453288/b0401bc195e.pdfIn PDF document text
    • http://xexodejefapupel.iblogger.org/resegizojudilarula.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412999/normal_600fc4478c58a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453885/normal_6001dd53e9b47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451231/normal_5fd29890c38fb.pdfIn PDF document text
    • http://rijupoxog.22web.org/daydreamin_ariana_grande_piano_sheet_music.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451206/normal_6063715071af9.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://ralununajopupe.epizy.com/machine_learning_algorithms_in_python_projects.pdfIn PDF document text
    • https://s3.amazonaws.com/xotomisen/merriam_webster_apk_latest.pdfIn PDF document text
    • https://s3.amazonaws.com/juliziwojatige/29746761645.pdfIn PDF document text
    • http://nuxibuzejapise.epizy.com/large_format_camera_lens_image_circle.pdfIn PDF document text
    • https://s3.amazonaws.com/xubifupi/60015353852.pdfIn PDF document text
    • http://xojozemuxubiv.epizy.com/59624518383.pdfIn PDF document text
    • https://s3.amazonaws.com/wukevirenesu/6069135833.pdfIn PDF document text
    • http://molojagevatabu.rf.gd/11381095423.pdfIn PDF document text
    • https://s3.amazonaws.com/pewebopufupe/free_printable_kindergarten_worksheets_letter_u.pdfIn PDF document text
    • http://fexenisidewa.rf.gd/fizojufesazawoferewed.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_off0000e694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE694 5108 bytes
SHA-256: 4268f457af8de9a63ba24e18fec43df58fdbfb06661d462f3dfa3f96b354d6c8
font_01_sfnt_off0000f7c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C2 10488 bytes
SHA-256: b1263df2c0a09efaa30cfa12b760911af79316e2ae215d3f2414f9c0eea79f94
font_02_sfnt_off00011bb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB5 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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