Malicious PDF — malware analysis report

Static analysis result for SHA-256 811189cfa0e92814…

MALICIOUS

PDF

61.1 KB Created: 2021-02-17 01:20:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 2851a5506e9173cefa9c7a85cd25c35f SHA-1: 55e67412e7d6423be210f92f436822192c758642 SHA-256: 811189cfa0e92814ba7cccb2baa9681daf59f61cef904c52d48de06bd8ef7e70
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 point to PDF files, suggesting a link farm or SEO abuse tactic. One of the primary URLs, https://jacksth.ru/wix?keyword=brookstone+auto+wine+opener, appears to be a lure for users searching for a specific product. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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/wix?keyword=brookstone+auto+wine+opener PDF link annotation
    • https://cdn.sqhk.co/wojidumezu/ihUelQk/vijoxaveliloporaz.pdfIn PDF document text
    • http://xegafutulon.iblogger.org/is_there_an_app_that_can_scan_barcodes.pdfIn PDF document text
    • https://resonorur.weebly.com/uploads/1/3/4/8/134874279/gagunibubipekumax.pdfIn PDF document text
    • https://wiwokuvivatazu.weebly.com/uploads/1/3/4/6/134629214/xujonewifisuri.pdfIn PDF document text
    • https://vematonejos.weebly.com/uploads/1/3/1/3/131383464/zevutukaxu.pdfIn PDF document text
    • https://lefusovu.weebly.com/uploads/1/3/4/0/134040443/fenezegud.pdfIn PDF document text
    • https://lejimawemo.weebly.com/uploads/1/3/0/7/130739028/4340192.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527357/normal_5fdbcf771a3b0.pdfIn PDF document text
    • https://ketowijogi.weebly.com/uploads/1/3/5/9/135985413/xazup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390055/normal_60222389007d7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://muwumatenenuli.rf.gd/1320653048.pdfIn PDF document text
    • https://s3.amazonaws.com/lekizopiloref/35721813805.pdfIn PDF document text
    • https://s3.amazonaws.com/tesodagiwor/corona_sdk_tutorial.pdfIn PDF document text
    • http://virojokezof.rf.gd/altivar_312_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/bejideba/45878707300.pdfIn PDF document text
    • http://pitolujebenim.epizy.com/25056136416.pdfIn PDF document text
    • https://s3.amazonaws.com/jezekemunidup/bamthathile_music_fakaza.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_off0000b505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB505 4988 bytes
SHA-256: b31b793985574fe02550568f58b91c7168fa09962ac7357a2826d01a0db1da13
font_01_sfnt_off0000c621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC621 9848 bytes
SHA-256: b347dcc5fb9557375d1c7e8daf8b635d4cea97ca8559559132b6d49445e84abc

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