Malicious PDF — malware analysis report

Static analysis result for SHA-256 51f372b452d4e655…

MALICIOUS

PDF

76.6 KB Created: 2021-03-19 06:04:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 8b52a33c08d56d970aa78e1d517adf00 SHA-1: a558d93b3d62f7b826dcf100303d2e29d68d7f08 SHA-256: 51f372b452d4e6551e8d5c79cf3e9ce05fe974e861a0defc1664681aed3da62d
214 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, identified as a link farm, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK. The primary malicious URL observed is 'https://crophysi.ru/strik?utm_term=2000+dodge+ram+repair+panels', which is likely used to redirect users to malicious content. The presence of numerous links and the ClamAV detection suggest a phishing or malware distribution attempt.

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://crophysi.ru/strik?utm_term=2000+dodge+ram+repair+panels In PDF document text
    • http://berkeciftci.net/477616790280nzg.pdfIn PDF document text
    • http://shop-profildoors.ru/what_is_a_diversity_statement_for_a_job_applicationa4h17.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://s3.amazonaws.com/tizowodifi/buzedalaxe.pdfIn PDF document text
    • https://6b54b0b2-91db-43cc-88c8-bbc4f7e20b37.filesusr.com/ugd/a773aa_789d2218db464d2485e35c781f0ea6a3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/38a75f63-9b6c-42a3-8fb7-68e3193a9c7d/89039757217.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfc44731-9512-4be3-a2b0-bf04d363c56d/software_application_architecture_diagram_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f718f1e-60fa-4378-a207-7ed906e8fb05/comtrend_ar-5381u_quick_setup.pdfIn PDF document text
    • https://s3.amazonaws.com/babuxufarizuxur/linux_tools_eclipse.pdfIn PDF document text
    • https://s3.amazonaws.com/fogibi/retract_resignation_template.pdfIn PDF document text
    • https://s3.amazonaws.com/kotodur/google_chrome_version_62_apk.pdfIn PDF document text
    • https://ebc1add8-0b9d-418e-9e4a-1e287827e933.filesusr.com/ugd/ab63e3_b7351cb6113a443981c8b03ba728c162.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/12296f74-56b3-417e-8a99-ffa87c829b24/fantastic_beasts_screenplay_book_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72388486-7ab2-417f-85b2-975b7178e603/what_does_sober_mean_in_aa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2248b424-2657-43e2-8611-8433f8bf25af/basic_engineering_circuit_analysis_solution.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0ca9742-bb5d-4fdc-955f-61d676080646/gakokome.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a52a544-a597-4a9e-b7b6-e114472dcc36/65738573370.pdfIn PDF document text
    • https://30cc9e9c-6145-4029-bfdc-d0561bdb3a10.filesusr.com/ugd/0dcf4b_a7d1ec568e104961ad34f5b2cd9094d2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/48c2a59b-8bd6-4fa6-99aa-e86a8fb3ddc3/13284743799.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cea85643-3f6e-4276-af66-8b4366154daf/56283642257.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56303303-794f-49a5-95b8-2a2caf72c030/27278264266.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_off0000e12a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12A 5168 bytes
SHA-256: 48eec50d717270cd6c40878ca0724d1a85405242904f9dff9839814d36196cc7
font_01_sfnt_off0000f283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF283 10736 bytes
SHA-256: cf98a79c5eb9c6fd9a0e1393d44fba76d73ee23a968a765d515752c32e0767f6
font_02_sfnt_off0001170c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1170C 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f