Malicious PDF — malware analysis report

Static analysis result for SHA-256 87d26d374d7c2258…

MALICIOUS

PDF

80.9 KB Created: 2021-04-26 17:49:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 22b51ab55c4efd62bbe866f09ab217b5 SHA-1: 7b25a423578ab196cf1b93fcd7092f89375ad3db SHA-256: 87d26d374d7c2258225dff80ff89dd7609aec2be21ff263a4a42287cab8e9936
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 disguised as search results for common queries, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards a redirection or download mechanism, likely involving embedded JavaScript to facilitate 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://golowaki.ru/strik?utm_term=why+is+my+furnace+not+kicking+on+in+my+camper PDF link annotation
    • https://vugevosuza.weebly.com/uploads/1/3/5/3/135328642/5780465.pdfIn PDF document text
    • http://mamafiposorugul.sportsontheweb.net/liranojoliwo.pdfIn PDF document text
    • https://wobanavemo.weebly.com/uploads/1/3/4/0/134096337/mijomuf_bipexosatew_mepoxujosewiwaj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374024/normal_6002e55c1a797.pdfIn PDF document text
    • https://wovigapugup.weebly.com/uploads/1/3/2/7/132710676/9158402.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480878/normal_6047b8a3698c3.pdfIn PDF document text
    • http://wupevijijoze.mygamesonline.org/takeuchi_tb016_workshop_manual.pdfIn PDF document text
    • https://fetavagipiw.weebly.com/uploads/1/3/1/3/131380759/fokulogebep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378155/normal_606b45d94f75c.pdfIn PDF document text
    • http://fakutuzogazu.sportsontheweb.net/sujababade.pdfIn PDF document text
    • http://sudilufib.getenjoyment.net/dodemanomujewus.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://s3.amazonaws.com/fifomi/the_game_neil_strauss_movie_trailer.pdfIn PDF document text
    • http://bexopikirekide.rf.gd/75562181424.pdfIn PDF document text
    • https://s3.amazonaws.com/viregujipowuru/48166432269.pdfIn PDF document text
    • http://kedokonox.rf.gd/dopovapexidalepubose.pdfIn PDF document text
    • https://s3.amazonaws.com/jigezilor/tobalisizawetuvabikewef.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwosil/2317674963.pdfIn PDF document text
    • http://suvasin.epizy.com/swot_analysis_of_self_example.pdfIn PDF document text
    • https://s3.amazonaws.com/baxunaf/folded_business_card_template_microsoft.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8d05ee9-a1cb-49a2-8d74-96359bb0eeeb/nuful.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3491efe7-5c33-48f3-979b-9e169bc5548b/why_is_my_printer_not_printing_correct_color.pdfIn PDF document text
    • http://zovaner.rf.gd/tejazefet.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://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED66 5576 bytes
SHA-256: 7809651ae3bfcda61c5d47e365306e9dfbfcc12c9efff772486209b2d6d2769f
font_01_sfnt_off00010041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10041 6068 bytes
SHA-256: d8e4b7f44dfb66ea49c7f1cefd345a391fade3fb548cc17de4cdbf151663dabd
font_02_sfnt_off00010ff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF2 11008 bytes
SHA-256: 4b5fea5233f96eeb71a6289bc2ee38cea2db444d14419d6f89519443dfa33027

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