Malicious PDF — malware analysis report

Static analysis result for SHA-256 5721b65587a60645…

MALICIOUS

PDF

77.3 KB Created: 2021-05-28 03:43:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: d5bef392cdcd3e0d53b8e3a3fd5cabf4 SHA-1: e90022a0c2b5ebf8ae4edb3eae21c225eabbc1f5 SHA-256: 5721b65587a60645b4bb3eddc4aa40385a85b66394235b920ff2317b57b078a5
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dafemum.ru/strik?utm_term=samsung+j415f%252Fds+flash+file+download PDF link annotation
    • https://falusawo.weebly.com/uploads/1/3/6/0/136084102/gijisenu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476765/normal_604d2583b3232.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494165/normal_603662d525b9e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459324/normal_5fe698cb72e47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478378/normal_601a197e8097f.pdfIn PDF document text
    • https://nelibijejukeli.weebly.com/uploads/1/3/1/4/131437261/07f7d4.pdfIn PDF document text
    • https://xarotiwarez.weebly.com/uploads/1/3/1/4/131406970/7c1282b580d9e6.pdfIn PDF document text
    • https://xogepojofaridel.weebly.com/uploads/1/3/2/7/132741214/wugogedemikekar.pdfIn PDF document text
    • https://danawojigu.weebly.com/uploads/1/3/1/4/131407111/kasekaparezi-lerara-wujakudukerigi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/c0db32c6-4d2e-4911-a481-b98e75022e72/what_does_god_says_about_cheating.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3f5b90b-4b6f-4d63-a2fc-e6649e446177/what_is_policies_and_procedures_in_the_workplace.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b975aeb-ff6b-46d2-a115-be057af498d4/oracle_certified_professional_java_se_11_programmer_ii_study_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/246e3e4b-ad3b-41db-9149-121271b37f53/hunter_x_core_controller_wifi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4887dd9-7fa5-4064-8c5d-13e1ab22df18/how_large_is_the_american_navy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3bba35f-bf60-4ff7-b601-0e1f2647359a/what_type_transmission_fluid_for_1996_jeep_cherokee.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e70d1913-74fe-4f6e-afad-36ccb9fb0ff0/migenebobuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8bbdcb1-089e-4394-b803-fb320fcb3a6e/38275150884.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/435080d0-e14d-4bec-9ffe-ff7bfeebb89c/science_of_mind_textbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d66f5d21-1b8a-4112-b631-b3ff739e5dc8/the_trials_of_apollo_book_4_audiobook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4191241b-a172-4f0d-b7ce-d871b0363948/5504926704.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e22b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22B 5600 bytes
SHA-256: f5117aee4f8fea274cf95b7587675f2bebac84f68fa350e684aae8678624cf4b
font_01_sfnt_off0000f527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF527 10580 bytes
SHA-256: 66fb6046894639804ffebdc096a759155e356385b50a3236464d7fc9e85cea98
font_02_sfnt_off0001199a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1199A 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3