Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e1a39aaf43d9822…

MALICIOUS

PDF

79.8 KB Created: 2021-02-24 17:26:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: efd2fedd3eeeb9ce72f30cd922dd679f SHA-1: becb805dfa6e6fb3257c8cb9bd12a563d435b3bd SHA-256: 5e1a39aaf43d98220cf0c47fb64ad531d6c2f79d46707e976ee657361cc80963
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links pointing to disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious content, likely involving a spearphishing attachment as the initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/123?utm_term=edminister+electric+circuits+pdf PDF link annotation
    • http://summerita.fun/il_classicismo_musicale_scuola_media03l9g.pdfIn PDF document text
    • http://maykistore.ru/samsung_galaxy_tab_a_8.0_sm-t350_batterytkus4.pdfIn PDF document text
    • https://rukifutotusiz.weebly.com/uploads/1/3/4/6/134685592/5515916.pdfIn PDF document text
    • http://prostosite.site/77534481872iq6se.pdfIn PDF document text
    • https://wuvotawek.weebly.com/uploads/1/3/4/8/134872633/vofatorejiwetodijo.pdfIn PDF document text
    • https://wisiwojapano.weebly.com/uploads/1/3/4/8/134896472/peberele.pdfIn PDF document text
    • https://fetibafavi.weebly.com/uploads/1/3/0/7/130776688/39b1c21794a266.pdfIn PDF document text
    • http://mon-cmso.best/ecb_coach_session_planner_template117s2.pdfIn PDF document text
    • http://svarka-aurora.online/fafepunasiriluvofoxu3ldvw.pdfIn PDF document text
    • http://bilkaita.space/o_manifesto_ambiental_de_noah_stealthlppm.pdfIn PDF document text
    • https://zesakexe.weebly.com/uploads/1/3/5/3/135314388/2442d79.pdfIn PDF document text
    • http://reduslimitaly-ufficiale.website/gosexepenanuduwotepamixctmdr.pdfIn PDF document text
    • https://digokevun.weebly.com/uploads/1/3/4/7/134747151/d126e5538a1c435.pdfIn PDF document text
    • http://bottlechainworld.com/420620602957t10f.pdfIn PDF document text
    • https://misamizejip.weebly.com/uploads/1/3/4/3/134348089/ladej.pdfIn PDF document text
    • https://mesupajediruz.weebly.com/uploads/1/3/6/0/136051454/sedotoperone.pdfIn PDF document text
    • http://salonvarna.com/adobe_flash_player_npapi_pluginglwnf.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://dasujisetojasel.epizy.com/roweto.pdfIn PDF document text
    • http://fojinejadasetax.epizy.com/20592379.pdfIn PDF document text
    • http://tutivute.epizy.com/59214243461.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_off0000f0a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A0 4820 bytes
SHA-256: be3b70e32890d5aa7a89dad71c058b30cc36a9850b10526cbeee17a16a470691
font_01_sfnt_off000100e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E3 10156 bytes
SHA-256: ff178408471b01734ed4e8d6993311c2fcfed6de4639378b2d0633fa06faa88c
font_02_sfnt_off000123a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A8 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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