Malicious PDF — malware analysis report

Static analysis result for SHA-256 672ef8bce35e8863…

MALICIOUS

PDF

112.5 KB Created: 2021-03-15 07:54:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 1986d57ec3ebc6872bfefa6c531328d1 SHA-1: 205f842c11e5661b8a231e62272d39f1576f33c0 SHA-256: 672ef8bce35e8863411da68eb7f40e8045d0a951e397d514e84199d07032186f
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links pointing to disposable domains and Weebly-hosted files, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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 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/123?utm_term=html+form+action+function PDF link annotation
    • http://guditoresuz.22web.org/13847107457.pdfIn PDF document text
    • https://kererivodukeje.weebly.com/uploads/1/3/5/3/135303009/depobimur.pdfIn PDF document text
    • http://gobegoxox.22web.org/78782529630.pdfIn PDF document text
    • https://nawawedivoxoni.weebly.com/uploads/1/3/4/7/134719505/bukotegenozavalu.pdfIn PDF document text
    • https://wupixizot.weebly.com/uploads/1/3/5/3/135398135/60123.pdfIn PDF document text
    • https://xukokamil.weebly.com/uploads/1/3/4/3/134317204/dabomisosabe.pdfIn PDF document text
    • http://appletopshop.ru/bekhayali_song_mr_jatt_kabir_singhv0sb2.pdfIn PDF document text
    • https://xubejuvanexog.weebly.com/uploads/1/3/5/3/135311054/246622.pdfIn PDF document text
    • http://pitushok.fun/spanish_demonstrative_adjectives_exercisescvj2q.pdfIn PDF document text
    • http://idealslim-italiaoficial.site/67394103785jg80w.pdfIn PDF document text
    • http://flebolog24.com/how_to_find_n2_in_snells_law2qy65.pdfIn PDF document text
    • https://zasoliwex.weebly.com/uploads/1/3/5/3/135318241/dcaac679dba.pdfIn PDF document text
    • http://paxawujaxoda.22web.org/what_is_my_romantic_orientation_test.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://fadirejanebebi.epizy.com/83707661724.pdfIn PDF document text
    • https://s3.amazonaws.com/mizeteb/anesthesia_surgical_procedures.pdfIn PDF document text
    • http://godolefimew.epizy.com/dreamworks_dragons_wild_skies_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/mukutud/vojevewusam.pdfIn PDF document text
    • https://s3.amazonaws.com/pilazi/white_christmas_song_movie_holiday_inn.pdfIn PDF document text
    • https://s3.amazonaws.com/pomaxa/hants_journal_court_report_june_2019.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD836 43100 bytes
SHA-256: 99b9c9091259a4293c0fd2cdf3c75a84b7cea70148f0821be46a27bf6d3298ae
font_01_sfnt_off00015bd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BD8 4576 bytes
SHA-256: e18595e2424582875d392712d06d0783a5d16a697a045489af0655f448a058fd
font_02_sfnt_off00016b39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B39 10788 bytes
SHA-256: 7916a7d3518b90461d6cb56a13f6a32dd0c8872d6fd142dcf67183786fb0d5a5
font_03_sfnt_off0001902e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1902E 16076 bytes
SHA-256: 3297641ac1c520fa07a814abcb1602bf250618c318606fcc1f22630ea3106d7f
font_04_sfnt_off0001a4d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A4D3 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333