Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f501526b82d493d…

MALICIOUS

PDF

73.9 KB Created: 2021-03-16 08:07:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3279b173c644c1fb61e5668e4413c51c SHA-1: 9ff0baa58924cb346a484d78e64c8facf624d3d0 SHA-256: 5f501526b82d493da8c90e2768e196c3a13c8a957eaa199dc222929674d6caf5
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 0.9997

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://baarspo.ru/aws?utm_term=data+analysis+methods+in+research+methodology PDF link annotation
    • https://cdn.sqhk.co/sofopiro/8gfTDhi/xurujod.pdfIn PDF document text
    • http://idealicaitalia-official.site/61449694651oq0o8.pdfIn PDF document text
    • http://itnegozio.info/how_to_connect_my_onn_bluetooth_headphones_to_computerqmdd1.pdfIn PDF document text
    • http://mantenancie.com/the_magic_flute_song_by_mozart522mq.pdfIn PDF document text
    • https://cdn.sqhk.co/delopomixaba/ciehjz0/wutisixapononutepapokop.pdfIn PDF document text
    • http://yoptan.space/93871374536zhmkt.pdfIn PDF document text
    • http://zovanatul.iblogger.org/paguxudumoxomegomamivi.pdfIn PDF document text
    • http://wewudiwiwojob.22web.org/bandook_chalegi_dj_gana.pdfIn PDF document text
    • https://cdn.sqhk.co/vajirasavuz/zuwHhfM/best_2020_books_by_black_authors.pdfIn PDF document text
    • http://hookup754.fun/4105184228458i7v.pdfIn PDF document text
    • https://cdn.sqhk.co/jowowibow/hjjz3ii/google_sheets_sumif_syntax.pdfIn PDF document text
    • http://lady-bug.club/5642562269093pyv.pdfIn PDF document text
    • http://megantv.site/63849204672gjywb.pdfIn PDF document text
    • http://vanlit.ru/3225379634732pyh.pdfIn PDF document text
    • http://findattime.com/laxosatumarokitabldf3g.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rakabexozu/fopugelowizakunoxavuf.pdfIn PDF document text
    • http://ranesewigiz.epizy.com/navy_blue_jacket_for_school.pdfIn PDF document text
    • http://jonevojufe.rf.gd/basic_english_words_with_tamil_meaning_download.pdfIn PDF document text
    • https://s3.amazonaws.com/lovetijif/54756857180.pdfIn PDF document text
    • https://9849c7ec-8b19-4b81-9a64-db2537ea7c40.filesusr.com/ugd/97b1c0_f3a83909a3d542398af563273c72496f.pdf?index=trueIn PDF document text
    • https://712e085e-8422-4094-ae2e-709d430f1fc9.filesusr.com/ugd/bf8edb_3163b7c8326a4f2aa0a0a8c1e38b7f10.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F8 5456 bytes
SHA-256: 8e7ee9ab2b59dcc8d1d26ee4d344122f51e2127f3765b29eccec31cc6028a7d9
font_01_sfnt_off0000f766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF766 10200 bytes
SHA-256: 96bfaed2f7b154e7739216f08b4eae7dd968b72942a737c1bd26e6423e73851e

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