Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1c866b134893c62…

MALICIOUS

PDF

76.6 KB Created: 2021-04-21 22:13:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c1c4d1761b3ae0eb1b7fad3d22eeda11 SHA-1: 8e6f9177ba098e5f8bda43ab8f809138c5ba73e8 SHA-256: a1c866b134893c62a770c83e597b1eae9687feed60bcd2b7c77b044e1d611da0
156 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://pelibifir.ru/strik?utm_term=holmes+humidifier+filters+walmart PDF link annotation
    • https://ruwatija.weebly.com/uploads/1/3/4/8/134846771/witinulufofowob_dutuxixu_nirideba_galeboxax.pdfIn PDF document text
    • http://tihefers.online/how_to_write_an_appraisal_report_exampleurdo7.pdfIn PDF document text
    • http://noriwisisun.iblogger.org/42910603216.pdfIn PDF document text
    • http://thefortykuti.com/2772655511194tyb.pdfIn PDF document text
    • https://domirirezup.weebly.com/uploads/1/3/5/3/135382932/5232480.pdfIn PDF document text
    • https://jenamojid.weebly.com/uploads/1/3/1/0/131070605/motimusa.pdfIn PDF document text
    • https://malitizume.weebly.com/uploads/1/3/4/0/134097131/mipilelumoso_ruxaturosulemir.pdfIn PDF document text
    • https://vozutadisifik.weebly.com/uploads/1/3/1/4/131483249/164ba76e16d1.pdfIn PDF document text
    • http://reform-st.ru/55794031241qjcgu.pdfIn PDF document text
    • https://vedoguru.weebly.com/uploads/1/3/1/3/131380953/rapuraz.pdfIn PDF document text
    • http://smm-target.ru/47646736134b1i9j.pdfIn PDF document text
    • http://futup.ru/how_to_become_a_cdl_instructor2bmz9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zukogi/11178254446.pdfIn PDF document text
    • https://s3.amazonaws.com/wuxupewu/65248099847.pdfIn PDF document text
    • http://mimiwuzoxul.epizy.com/13395381733.pdfIn PDF document text
    • http://piwiweranewu.rf.gd/begujajilevedabefudewake.pdfIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/asrb_ldc_admit_card_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/devuxuzejozam/45500764382.pdfIn PDF document text
    • https://s3.amazonaws.com/tixedujegibex/80586136328.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_off0000ebf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF8 5200 bytes
SHA-256: ede54243306bd230fb1235dfb7f749aea09aa928496ba48aa0cb673dce97a002
font_01_sfnt_off0000fd85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD85 11764 bytes
SHA-256: 4e60c771f689d8ebf62c2c825b1d2a7d7200a4352c8c09b8dfe9ea4860851cf7

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