Malicious PDF — malware analysis report

Static analysis result for SHA-256 4242cb7a01e20c60…

MALICIOUS

PDF

84.3 KB Created: 2021-03-21 06:43:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 2f92752d090b81e13e3221c115ce5134 SHA-1: 08bb77f5249c1a22cc8a1b0de8bfb93917ad8ed5 SHA-256: 4242cb7a01e20c607598e2878becf7d7f92525f1bc108769d6ad7a95a318549f
66 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a high-confidence ML classifier flagging it as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and the overall structure point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • 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/wix?keyword=unlawful+detainer+answer+san+diego PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4452834/normal_60149399cb2cf.pdfIn PDF document text
    • http://tells.fun/tetukafekafipotutpxr2r.pdfIn PDF document text
    • http://evromotors.net/tujofuxutumutimoqszw0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404529/normal_602790b4797a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426954/normal_6034d6a1bffbc.pdfIn PDF document text
    • http://sibasijiv.22web.org/cost_audit_report_of_reliance_industries.pdfIn PDF document text
    • http://xusatekekosigi.iblogger.org/hillsong_worship_songs_mix.pdfIn PDF document text
    • http://perevod-card2card24.site/s_letter_heart_imageswjqx1.pdfIn PDF document text
    • http://alex-chekalev.com/contractor_agreement_template_south_africaj9pif.pdfIn PDF document text
    • http://tesar-krd.ru/temekonejiwusotnr3l3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475215/normal_5fd1146bbf9bb.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://s3.amazonaws.com/bidemewufa/ivy_global_act_practice_test_answers.pdfIn PDF document text
    • https://0aa989e7-076c-475f-bc22-fff5ae310860.filesusr.com/ugd/b44be6_5bd84aa5f1014a8aa05a41aeb6d0722a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/risalenefazozo/pinobigiziwu.pdfIn PDF document text
    • http://semekumuxolat.rf.gd/slant_out_meaning_in_urdu.pdfIn PDF document text
    • https://s3.amazonaws.com/wofaxil/wow_tailoring_guide_wotlk.pdfIn PDF document text
    • http://bigobawavelig.epizy.com/70789239526.pdfIn PDF document text
    • https://s3.amazonaws.com/jepavilutabilel/airport_city_android_walkthrough.pdfIn PDF document text
    • http://remobufu.rf.gd/65969996030.pdfIn PDF document text
    • https://101c3d73-5e22-4da1-a203-a3a2a794ce88.filesusr.com/ugd/69a512_1fc5104f72b644c99eda2e80711f132d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wujafivabipo/self_certification_form_minnesota.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_off0000fc9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9E 5040 bytes
SHA-256: f1b1f439751dd50d0cadfbf1c8ba48b577f0a808924fadc08204d3f510ec3ae0
font_01_sfnt_off00010de0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE0 11736 bytes
SHA-256: aebd31fa0a0a68f4d1267d369c596b4efc3723af1521a392b8fbb07a8a992674
font_02_sfnt_off000135de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135DE 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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