Malicious PDF — malware analysis report

Static analysis result for SHA-256 df9c144d6a0868ab…

MALICIOUS

PDF

76.3 KB Created: 2021-04-01 20:30:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 86c42ff6495a3b67e678fe41697552f1 SHA-1: b697c6dd4a00f3f7ffb494c8a8473636d8a91337 SHA-256: df9c144d6a0868ab434175148ca71c9ff55c065444f2a0060b89a21ffed6a54a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are dynamically generated or use generic filenames, indicating a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and numerous external URIs point towards an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://mezovuduw.ru/award?keyword=arrabales+de+leningrado+pdf
    • http://fezelegafefuv.mywebcommunity.org/chris_hemsworth_workout_plan.pdf
    • http://fubikopelemom.mypressonline.com/how_to_factory_reset_a_samsung_dryer.pdf
    • https://cdn.sqhk.co/banuluwopote/ihP2Pie/dixusirizoleruzasafaba.pdf
    • https://cdn.sqhk.co/fedovusig/jbjfeib/32195864609.pdf
    • https://cdn.sqhk.co/batumozi/dxeheia/butajixad.pdf
    • http://svoydvalend.xyz/epson_workforce_840_black_ink9xq1c.pdf
    • http://vanibunogi.iblogger.org/attestation_sur_l_honneur_statut_auto_entrepreneur_pole_emploi.pdf
    • https://cdn.sqhk.co/fegukajebaj/dgjEh5W/82645253906.pdf
    • http://b4shop.icu/wurirukwwzbs.pdf
    • http://minuette.me/minutes_of_meeting_template_samplel8ga2.pdf
    • http://odemebayisitrafik.com/mekolutopijarse66m.pdf
    • https://cdn.sqhk.co/pajubopolak/kjigeja/fusij.pdf
    • http://torchqbfl.fun/zanumobofpzge.pdf
    • http://xamawigokoke.mygamesonline.org/ratio_and_root_test_for_convergence_of_series.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://51956041-da35-40aa-96c1-085c1f47c80d.filesusr.com/ugd/e6e573_1a2439a6bbdd40eba0577f8fb5cdf75c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/67fa9bdb-d50c-4dba-a8e4-f7a9cbe06260/how_to_make_jello_in_a_bundt_pan.pdf
    • http://ponenasese.epizy.com/44256327473.pdf
    • http://vamafawuf.epizy.com/how_many_calories_in_a_dunkin_donuts_iced_coffee.pdf
    • https://uploads.strikinglycdn.com/files/fdc27de4-0d3b-48ec-958d-1ea9fb486c71/icewind_dale_enhanced_edition_best_classes.pdf
    • https://uploads.strikinglycdn.com/files/a0cd9a2e-e443-467c-a55c-4ada1fad628e/will_a_universal_remote_work_on_a_converter_box.pdf
    • https://3ecb585b-79b8-4502-8567-d9a17299c5c1.filesusr.com/ugd/4b874d_df67088134d949b5a3fb8854d108311e.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8d7.bin
021b49052f976d4091cc7acd3b2f028aac11a4570ba8ce1c6844ead82b5a74cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D7 5336 bytes
font_01_sfnt_off0000fb07.bin
7de5449b8c20b5afcd02fd97863fa5abee8f36c16934a33574722dd90ea30dab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB07 12372 bytes

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