Malicious PDF — malware analysis report

Static analysis result for SHA-256 7887571b65d4251d…

MALICIOUS

PDF

75.6 KB Created: 2021-01-23 00:14:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 2a29ac9af0c5de2f2c5f255ca35818fa SHA-1: 6834d0bde32640ad0d6b1a1788da7cf398cd1b19 SHA-256: 7887571b65d4251d657ca0920f359b7647ca50a622cb653839ae42a80f29f3b1
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for link farms and phishing sites, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The primary URL, 'https://jacksth.ru/aws?utm_term=facebook+video+er+apk', suggests a lure related to Facebook videos, likely to trick users into downloading malware or revealing credentials. While no scripts were explicitly extracted, the PDF structure and the high ML classifier score strongly suggest malicious intent, possibly involving embedded JavaScript for exploitation.

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://jacksth.ru/aws?utm_term=facebook+video+er+apk PDF link annotation
    • https://kokubexajaluk.weebly.com/uploads/1/3/2/6/132681668/tejuvawezudebi-bidep-fixizejiniw.pdfIn PDF document text
    • https://lapawiniposa.weebly.com/uploads/1/3/5/3/135323982/tuvuwup.pdfIn PDF document text
    • https://davabodijesofid.weebly.com/uploads/1/3/4/4/134474123/5b3fc2d2ea486d.pdfIn PDF document text
    • https://kutebebi.weebly.com/uploads/1/3/4/5/134528954/3772176.pdfIn PDF document text
    • https://sazotavivi.weebly.com/uploads/1/3/1/1/131164406/577321.pdfIn PDF document text
    • https://site-1176160.mozfiles.com/files/1176160/misufogufegubibekida.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413244/normal_5ff32abea37cb.pdfIn PDF document text
    • https://wisukasef.weebly.com/uploads/1/3/1/4/131453855/3432587.pdfIn PDF document text
    • https://site-1178444.mozfiles.com/files/1178444/uae_exchange_near_me_timings.pdfIn PDF document text
    • https://xeromikivato.weebly.com/uploads/1/3/2/6/132695960/198bfb.pdfIn PDF document text
    • https://vixadabunukup.weebly.com/uploads/1/3/4/9/134902839/0cc930f4.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/davubewu/bardo_thodol_padmasambhava.pdfIn PDF document text
    • https://s3.amazonaws.com/gurupixabogivaz/nj_jury_duty_reporting_mercer_county.pdfIn PDF document text
    • https://s3.amazonaws.com/rufonali/spreadsheet_software_better_than_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/bokexizometun/microsoft_internet_explorer_11_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/puretulenuza/kimejuxoxezamogizipelanif.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_off0000eb36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB36 5076 bytes
SHA-256: e6edc3b4c5bbe3158eb2c3895956b3cb60493dd0bf673d4380bed18719873863
font_01_sfnt_off0000fc8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8D 10748 bytes
SHA-256: 005f08c84256132a6f23f0cab800dd88607bae9d0e50b4a0f78c6768824517b9

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