Malicious PDF — malware analysis report

Static analysis result for SHA-256 8daecfc7029e55c0…

MALICIOUS

PDF

80.1 KB Created: 2021-03-15 02:44:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 7a8e3b9af47dc12e6c0b30b8f40ae5f1 SHA-1: d2330325c39ce9cd21deecacc9688ec20bccd088 SHA-256: 8daecfc7029e55c0a8b3c76771137e65ec84189473241213bcdd66ce8bfce25c
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm designed for SEO and phishing. One prominent URL, 'https://resalured.ru/strik?utm_term=can+a+software+tester+become+a+project+manager', is flagged as a redirector. The document impersonates cloud services, further supporting a phishing or malware distribution lure. ClamAV also detected the file as 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://resalured.ru/strik?utm_term=can+a+software+tester+become+a+project+manager PDF link annotation
    • http://wiwafapudipib.iblogger.org/k7_antivirus_free_2019_windows_10.pdfIn PDF document text
    • http://koxelovanalimu.getenjoyment.net/65033328266.pdfIn PDF document text
    • http://pimovanurebi.22web.org/ipcc_1._5_report_october_2018.pdfIn PDF document text
    • http://gexopidikimo.mygamesonline.org/how_to_use_cricut_cartridges_with_maker.pdfIn PDF document text
    • http://rolapisi.scienceontheweb.net/mewoditagizijasugadoritik.pdfIn PDF document text
    • http://zobebukore.22web.org/active_to_passive_exercises_b2.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/norozovijalu/kurebuwozirosadelu.pdfIn PDF document text
    • https://4cf6c2b4-cd84-4b73-83b1-bf7f441162b2.filesusr.com/ugd/e50c99_b1743c78dceb4361a113f861cc183600.pdf?index=trueIn PDF document text
    • https://34ec465e-51aa-4dba-9a8c-c05fcfb5ae84.filesusr.com/ugd/df15ee_f9677e9e9d724bdf8b13fb014ed6187f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/napisakaluja/12315790121.pdfIn PDF document text
    • https://s3.amazonaws.com/patotale/21396379426.pdfIn PDF document text
    • https://s3.amazonaws.com/lokijuronig/9460446368.pdfIn PDF document text
    • https://27475d5a-2981-497d-8cd5-0c310ef10f8b.filesusr.com/ugd/9cb927_42738c5dda304f9eacffa54d283f9733.pdf?index=trueIn PDF document text
    • http://feruvine.rf.gd/college_physics_a_strategic_approach_4th_edition.pdfIn PDF document text
    • http://lewinozed.atwebpages.com/how_to_use_cool_mist_ultrasonic_humidifier.pdfIn PDF document text
    • https://44407f20-7244-4107-9544-84d8151b6f9a.filesusr.com/ugd/8508de_6406d5adbbb9420fba6583b73c9d1300.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xotomisen/joker_movie_meme_template.pdfIn PDF document text
    • http://seporuguwav.rf.gd/goranujigudilejopari.pdfIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/cnn_news_on_the_election_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/sasufufa/mozilla_firefox_version_50_to_65._0.pdfIn PDF document text
    • https://03df18d0-0a94-4077-8b44-1f3cf8b7c870.filesusr.com/ugd/23a6c3_9895e6721de54a26bf2372d309878d4c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nolarifaforuxop/5307861515.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB20 5516 bytes
SHA-256: b5b105a74fc16c5acd8ce6d24945d962e1c1de3656b13c6e1ea7fdbb7984d228
font_01_sfnt_off00010de0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE0 10788 bytes
SHA-256: e27c2dea734829245aec30ababc37d7ceb81ffcfd03115d56aaed6c15a284688