Malicious PDF — malware analysis report

Static analysis result for SHA-256 37227eb801c46538…

MALICIOUS

PDF

75.3 KB Created: 2021-03-17 10:29:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 5922ffaf028de5b1bd71945a99527df0 SHA-1: b183ea46a5402f8a93e296544a4c4ad2b035f58d SHA-256: 37227eb801c46538248b2822a65fa5533c7ddbb2af9fd1993ec067acd82be522
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with the primary URL being a link farm designed to mimic search results for a PDF document. This suggests a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://xajibur.ru/wix?keyword=visualizing+the+lifespan+1st+edition+pdf PDF link annotation
    • http://pexawegowe.mywebcommunity.org/tibogolojiwa.pdfIn PDF document text
    • https://dukazisilibe.weebly.com/uploads/1/3/4/6/134679988/c7add0fe9d883aa.pdfIn PDF document text
    • http://bagedejatobino.22web.org/40812826948.pdfIn PDF document text
    • http://ditoterelutas.sportsontheweb.net/9329827804.pdfIn PDF document text
    • https://gorejirulikem.weebly.com/uploads/1/3/4/7/134738880/d91edd554fbe49e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464873/normal_5fcdeae126b5b.pdfIn PDF document text
    • https://votozugilom.weebly.com/uploads/1/3/1/0/131071295/ponulituli_xoguxokasimod_lipujinugatow_wawavezilimibib.pdfIn PDF document text
    • http://nufapivevavenak.22web.org/71895493553.pdfIn PDF document text
    • http://wasegulom.mygamesonline.org/67825279022.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501361/normal_5fd76e0d26500.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zonivezada/logofapupiwatuwipojefup.pdfIn PDF document text
    • https://s3.amazonaws.com/mefonevimimix/how_to_reset_pitney_bowes_postage_meter.pdfIn PDF document text
    • https://s3.amazonaws.com/jufowokedunod/22457418382.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be7269c1-8b02-45f7-9491-c3cef17654b7/definicion_de_investigacion_cuantitativa.pdfIn PDF document text
    • http://sovotovagito.epizy.com/wovuduwikatexuli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d739f61c-3237-41ad-a488-69c2b57ccfc0/backbeat_fit_3100_pairing.pdfIn PDF document text
    • http://nitumajalu.epizy.com/whats_the_coldest_it_gets_in_orlando.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4247d65-60a9-44aa-a2bc-7b0a43156b98/jack_reacher_cast_season_2.pdfIn PDF document text
    • http://muxenad.rf.gd/how_to_install_ice_maker_water_line_plastic.pdfIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/cours_automates_finis.pdfIn PDF document text
    • https://s3.amazonaws.com/jijari/cryptogenic_stroke_guidelines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/434820aa-fbbf-4596-948a-6b61dc9db03e/5.4_skills_practice_analyzing_graphs_of_polynomial_functions.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d60f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD60F 5276 bytes
SHA-256: 9fae6bbf3f49ad59d58231f1be5faf4cb69259d8684346a4dcb9d45e694fd303
font_01_sfnt_off0000e816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE816 9940 bytes
SHA-256: 755104a26b3bed5da171effe39bc3e2a56c664d968c8f7562dd40b4741ee9af4
font_02_sfnt_off00010a7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7F 16084 bytes
SHA-256: 3dd6252bb62cdcc21e2b76bdeb68ba6c8db9c2d08edae94764e010183c5b1848

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