Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1571c7086f3610a…

MALICIOUS

PDF

78.7 KB Created: 2021-03-23 01:43:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd2991d9c6b009ab2c680f5c3633d835 SHA-1: b5aefc9aa939eb9822d5c0ac9be30e51308a5409 SHA-256: f1571c7086f3610aefba03ea011b7caa42c46d525daebc45dcee37a3935d170d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to PDF documents, suggesting a link farm or SEO poisoning tactic. The primary URL, 'https://zajinet.ru/strik?utm_term=how+to+control+sony+soundbar+with+samsung+tv+remote', is presented as a guide but likely leads to malicious content. ClamAV detection and ML classification confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/strik?utm_term=how+to+control+sony+soundbar+with+samsung+tv+remote
    • https://cdn.sqhk.co/pavoraxebute/el8jclk/salesikagaziluv.pdf
    • http://sojafefewozuxub.iblogger.org/hiit_workout_book.pdf
    • http://vesimawamom.66ghz.com/folitewimebonobegusuxu.pdf
    • https://cdn.sqhk.co/jizesusaxeta/jfibjbt/mi_launcher_pro_apk_2018.pdf
    • http://tuzojexis.mypressonline.com/data_analysis_report_example.pdf
    • http://mimivudarevi.scienceontheweb.net/jodaduvakatapivimig.pdf
    • http://jerunurijo.iblogger.org/44065602050.pdf
    • https://cdn.sqhk.co/fetesulatol/dgIja6v/66806335737.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/50e58279-fbfb-4e58-9a54-de2997b28be4/74111166383.pdf
    • https://caa91486-5fcc-43b7-8b2b-5b817ae85bbe.filesusr.com/ugd/26bbcf_d1880d0bcfe442bc9427208d772e0dac.pdf?index=true
    • https://ddf64d59-5240-4154-9987-17dfc28e22c7.filesusr.com/ugd/cec570_bc375719242842f2b1f1a779898c2c5f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ab641e68-376b-4c0e-88fd-5be3ae635651/58678528400.pdf
    • https://uploads.strikinglycdn.com/files/359b186a-6710-4955-bf39-9ead66ccef3e/korg_d1600_mkii_service_manual.pdf
    • https://uploads.strikinglycdn.com/files/b1478ee6-3fd6-45dd-806a-a15a5f37cdaf/39662057440.pdf
    • http://xowitulodif.rf.gd/designation_in_visa_form.pdf
    • https://uploads.strikinglycdn.com/files/3b4470b0-ef6b-4ee7-880f-3c64601b889f/the_alabaster_girl.pdf
    • https://uploads.strikinglycdn.com/files/e3a2c6fe-0f17-46e5-b2b4-9367dcbae7a1/what_is_the_rule_described_in_the_peter_principle.pdf
    • https://uploads.strikinglycdn.com/files/affd2314-bb1f-469b-8c5a-b7d0bcfcb708/wexusedofuzekeso.pdf
    • http://retexibew.rf.gd/15307623608.pdf
    • https://1416a32c-f91c-4ec3-9c10-bfdf610c7df7.filesusr.com/ugd/76de1a_c873857f44ba4c3c93b561bcc9ec96aa.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e625.bin
2b3dd19e249337da0dfabef6cdc276a6079f075898d3d9c3f4ab6b2a51494f3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE625 5592 bytes
font_01_sfnt_off0000f909.bin
0a785937239480b09d0f8459903d6790a8a7ac957c18b67e3297a35565803738		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF909 11136 bytes
font_02_sfnt_off00011ebf.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBF 4324 bytes

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