Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b56f48c42451a20…

MALICIOUS

PDF

73.9 KB Created: 2021-04-15 23:09:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 0dac2b12f93478fe89587cc14d7ab3de SHA-1: 68243a9f896cc65e19350b94e589765cf0a8cfb5 SHA-256: 7b56f48c42451a20053b431af974616cf5126e2520b1346e10feaad83f98a652
214 Risk Score

Malware Insights

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

This PDF file contains numerous embedded links, many of which point to known malicious redirectors or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The document body, though heavily obfuscated, suggests a lure related to 'essay writing', which is then used to redirect to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=how+to+be+an+essay+writer In PDF document text
    • http://tilikef.mygamesonline.org/android_studio_tutorial_italiano.pdfIn PDF document text
    • http://zakomuxoza.getenjoyment.net/how_do_i_pair_my_old_xfinity_remote_with_my_tv.pdfIn PDF document text
    • http://valuburikodajad.medianewsonline.com/cognitive_development_in_late_adulthood.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4c72699b-aa2e-4dc8-8bd5-1a54e8f938a6.filesusr.com/ugd/f3cb45_cda3dec754d5494b953035e8086352d6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jifedefujodu/vixonabomemigelaxirep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cf86c36-09be-4e63-b2d8-78215f214f8a/are_body_fat_scales_accurate_bodybuilding.pdfIn PDF document text
    • https://6d4cd3b7-91e9-43ac-92b9-205473f1e50d.filesusr.com/ugd/28146e_54a48de52d4441a0bfb90b28325a2f02.pdf?index=trueIn PDF document text
    • http://bixozebaxikapos.atwebpages.com/what_are_the_danger_signs_of_high_blood_pressure.pdfIn PDF document text
    • https://s3.amazonaws.com/jusuberu/fivavafufalubewalepem.pdfIn PDF document text
    • https://964beff5-d24f-450a-94e2-fa7e9faef44a.filesusr.com/ugd/61158f_d622ef26f2eb411eb0a9912763746fd6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xukanomarexumu/86603995889.pdfIn PDF document text
    • https://s3.amazonaws.com/dupula/xeloposarikavavumuvuwir.pdfIn PDF document text
    • https://s3.amazonaws.com/kitakilesa/imb_piracy_report_2018.pdfIn PDF document text
    • https://3a5aa097-47f9-475f-9992-83bceef25cc3.filesusr.com/ugd/f55bec_b5ac5f26953445c18bdfa56b8f96b889.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/12797430-1e61-4dfc-b2cb-9d8332d83582/cpm_answer_key_course_3_chapter_8.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c650e26a-8106-472e-97d5-21ee98fbdd58/ratoluzupolarulusiguxabax.pdfIn PDF document text
    • http://zisukuvi.atwebpages.com/63072104103.pdfIn PDF document text
    • https://s3.amazonaws.com/vufupu/zimokaruju.pdfIn PDF document text
    • https://s3.amazonaws.com/netinuwa/gage_r_r_excel_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/toliwudalamem/atbu_screening_form_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33e5ed02-aa9d-4df0-a400-e0ce4541e139/rofuk.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_off0000e531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE531 4944 bytes
SHA-256: 322d424ef7c513984457ca4e4af4aa47d6e27ae446cf6809a0a19dc32dd64c28
font_01_sfnt_off0000f621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF621 10692 bytes
SHA-256: 391af72fe00693f1a42a7b8be8a6a81153ab387855fff2599784e1de3819b11d

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