Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b4896f9bd81567c…

MALICIOUS

PDF

86.4 KB Created: 2021-05-11 09:42:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: acc22546dbbd801d10aa3dc7b49d662e SHA-1: 15ed5ef5eae010b872e000a02529118d549ef06c SHA-256: 0b4896f9bd81567cb11c0e7c107c1c19d74f4550d1310b87b97685c927fa505c
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 0.9995

Heuristics 5

  • 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 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://vilenefex.ru/strik?utm_term=python+numpy+tutorial+pdf+free+download PDF link annotation
    • https://cdn.sqhk.co/nufopusifa/auhbjbU/41790405436.pdfIn PDF document text
    • http://rumafelaneli.mygamesonline.org/telugu_panchangam_calendar_2020_free_download.pdfIn PDF document text
    • http://norelowugazilu.22web.org/topuv.pdfIn PDF document text
    • https://cdn.sqhk.co/zeboxuze/iiajfib/musadixoxivopimut.pdfIn PDF document text
    • http://daliadiago.com/how_to_crochet_a_half_granny_square_scarf50svd.pdfIn PDF document text
    • http://detonic-ro.website/mogekego51678.pdfIn PDF document text
    • http://yoptan.space/simon_ideas_for_ielts_topicswsq3w.pdfIn PDF document text
    • http://hook-up.fun/42596858794xxqyx.pdfIn PDF document text
    • http://copyrightsupporteds.com/nanatsu_no_taizai_dublado_completo17ixo.pdfIn PDF document text
    • https://cdn.sqhk.co/nujudemugipi/gi6Dv0J/wuraxiromazare.pdfIn PDF document text
    • https://cdn.sqhk.co/vusabutam/aQhh9cJ/ripofemitafutelexenimo.pdfIn PDF document text
    • http://kelirajisob.66ghz.com/bhoot_fm_short_story.pdfIn PDF document text
    • http://pazolozul.mypressonline.com/kunobomux.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://juwesavel.rf.gd/free_autocad_viewer_for_windows_7.pdfIn PDF document text
    • http://podaviloridi.rf.gd/absolute_monarchy_in_russia_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/paxunu/android_10_fr_samsung_note_9.pdfIn PDF document text
    • https://s3.amazonaws.com/lososimap/lapoxokukogorunad.pdfIn PDF document text
    • https://caf0f927-206f-4b4e-aa34-0dd3da53679b.filesusr.com/ugd/83d902_6bfadb2c026047ddbbc9932a93f75e1a.pdf?index=trueIn PDF document text
    • https://16fd32d6-95e0-4b29-89ad-7162b4f2ffbe.filesusr.com/ugd/9f4b57_6191f23523944691a2adcfc6614cc554.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/muwomapotumugi/65024730627.pdfIn PDF document text
    • https://s3.amazonaws.com/bokelur/gifezopenidusujasogepo.pdfIn PDF document text
    • https://1dab3517-3db0-43ff-9fd6-b65b51f65b60.filesusr.com/ugd/565485_b5040a8f93ac4cacac0bb39af924d9e3.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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_off00010044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10044 6488 bytes
SHA-256: 6542865467da2b303e30bc40c9f6608170fbe32d9741ccf1f32970af5fbfcea3
font_01_sfnt_off0001104a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1104A 5300 bytes
SHA-256: d168241e91c2c1454ded9aa150e706ff26220a4bddd210d078881073f65d97ce
font_02_sfnt_off0001223a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1223A 12016 bytes
SHA-256: a370ea68303dafc7e9882535fa2122aeea509d39ae938ca34a31e33315d474b8

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