Malicious PDF — malware analysis report

Static analysis result for SHA-256 7db51802923086dc…

MALICIOUS

PDF

67.2 KB Created: 2021-03-28 21:08:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: a64eb5fedd8c960705a7618ec2d25b1b SHA-1: 4c917ac4ac57ca2141e1a1433466f160020e26fe SHA-256: 7db51802923086dc87cbabaf78417d53c1e63feefaba880c83d3b3613672bddf
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also flagged this PDF with a high probability of being malicious. The document body, though heavily obfuscated, appears to be a lure for downloading a PDF, likely to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://crophysi.ru/award?keyword=engineering+physics+by+avadhanulu+and+kshirsagar+pdf+download In PDF document text
    • https://cdn-cms.f-static.net/uploads/4374700/normal_602ca336bdbaa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365594/normal_601b69e7ce168.pdfIn PDF document text
    • http://dutusejutax.22web.org/annabelle_creation_full_movie_mp4_tamil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444643/normal_6058d9d40f012.pdfIn PDF document text
    • http://gagafelame.22web.org/anti_corruption_commission_maldives_job_application_form.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gixisenusadat.rf.gd/john_deere_115_automatic_drive_belt_diagram.pdfIn PDF document text
    • http://xuwewodufot.rf.gd/29383075220.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b718db40-d3dc-43d7-8e83-f837902ff858/best_indian_recipe_book_for_beginners.pdfIn PDF document text
    • http://liwivudelaje.epizy.com/wubidoluxalewirediwive.pdfIn PDF document text
    • http://gigitepusiligo.epizy.com/32355311794.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f0cacb7-05ff-4a27-a879-18be71bd3b7a/what_does_ralph_mean_in_the_bible.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a6ea020-a2fd-4193-ae5d-6111aaf3feee/83467256754.pdfIn PDF document text
    • http://gedokimisizat.rf.gd/judumabope.pdfIn PDF document text
    • http://natizuf.onlinewebshop.net/apparel_merchandising_process.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/403203ce-f588-48cb-b2b4-eec648d8c2ab/91595863530.pdfIn PDF document text
    • http://moxuzaridob.onlinewebshop.net/hip_fracture_classification.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_off0000c5cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5CC 5832 bytes
SHA-256: 746f4d36eb94a5f9928f03ff1f44f0f1ad26a1ec748385a533e8e5571fb56572
font_01_sfnt_off0000d9ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CA 10328 bytes
SHA-256: 187ba32658529967809a0d9c653b0e5dde0abfbafb94c3eb24880d2eb896bdf0

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