Malicious PDF — malware analysis report

Static analysis result for SHA-256 797f3d559c55c934…

MALICIOUS

PDF

76.7 KB Created: 2021-02-27 10:32:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: ef5d6f854d04f65d536e96cc73c84f61 SHA-1: 77869d27193ae71dba172f5d611737ca53ccf994 SHA-256: 797f3d559c55c9346ff6aa59decd6e5250249c52c1668fba0653415de11daffb
166 Risk Score

Malware Insights

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

The PDF contains multiple suspicious and invisible links pointing to domains that are likely part of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The presence of embedded URLs suggests an attempt to redirect the user to malicious content, potentially for credential harvesting or second-stage malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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/strik?utm_term=decolonizing+methodologies+research+and+indigenous+peoples+2nd+edition PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4418584/normal_60228287d2da6.pdfIn PDF document text
    • http://creditscorecard.info/data_analysis_with_pandas_and_pythonejpb2.pdfIn PDF document text
    • http://bilomibedaralo.iblogger.org/the_exploris_school_elementary_campus_raleigh_nc_27601.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381976/normal_5fecfadbbf36c.pdfIn PDF document text
    • https://fikadodovawewa.weebly.com/uploads/1/3/4/3/134320255/321eb.pdfIn PDF document text
    • http://artdebug.site/165p_bus_schedule_nj_transits6vod.pdfIn PDF document text
    • http://lnstagram-support.live/rival_gears_racing_apk_mod8rmls.pdfIn PDF document text
    • https://vowemiwa.weebly.com/uploads/1/3/5/3/135392560/rivunevipapaza_xojopekig_juforenut_galevusa.pdfIn PDF document text
    • https://nebofubegifeso.weebly.com/uploads/1/3/1/4/131437549/9335177.pdfIn PDF document text
    • http://online-sistem.site/what_is_canon_in_art_historyno7wt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478947/normal_5fe6e96a712d5.pdfIn PDF document text
    • https://pegugigatusib.weebly.com/uploads/1/3/4/4/134460290/vomaxositewex-kadikuw-gaxig-kusasix.pdfIn PDF document text
    • http://izzzaaa.space/secret_life_of_pets_2_chloe_catnip_songsu0iq.pdfIn PDF document text
    • http://online-bestshop.xyz/convert_to_image_using_imagemagick_in_php4oe1a.pdfIn PDF document text
    • http://romeital.space/the_arsonists_playhsz7u.pdfIn PDF document text
    • http://ontrade.top/vazemitosivusateou6oh.pdfIn PDF document text
    • http://teplotronic.ru/kung_fu_panda_3_kai_vs_po_in_spirit_realmmj98e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ee83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE83 5668 bytes
SHA-256: 78da0fc197f20ed23eac746b7b839331df3d178310c57f94f02284245d5098cc
font_01_sfnt_off000101ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101AB 10248 bytes
SHA-256: 447d8c38706ce412fa6063ca33d05df8f69ea4fafc6f20425ced90f1919c05a5

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