Malicious PDF — malware analysis report

Static analysis result for SHA-256 f595b5b21dcb04f3…

MALICIOUS

PDF

79.8 KB Created: 2021-03-16 20:52:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 03ba2ca13a88a12ad8dd99a9e957574f SHA-1: 536979d99984de976f08752b53a713e438dc3607 SHA-256: f595b5b21dcb04f306438cc86b1914cd81ce2e50f90514502591848faf707d6b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9997

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=rayovac+universal+battery+charger+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4443356/normal_6025bedbd4233.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421937/normal_5fd2a2a6f11cd.pdfIn PDF document text
    • https://xakowuval.weebly.com/uploads/1/3/5/3/135316831/dimifurowilel.pdfIn PDF document text
    • http://lojapidabud.mypressonline.com/75658121891.pdfIn PDF document text
    • https://sufusaripowo.weebly.com/uploads/1/3/1/4/131437865/tarafoditogaru-nixivafatewubu.pdfIn PDF document text
    • https://zisetilu.weebly.com/uploads/1/3/1/3/131382786/3aa05872ac.pdfIn PDF document text
    • https://vanufutalolu.weebly.com/uploads/1/3/1/1/131164160/2337577.pdfIn PDF document text
    • https://gakezepatirana.weebly.com/uploads/1/3/2/7/132712251/166341.pdfIn PDF document text
    • http://interstart.online/android_vulnerability_scanner_kalihoh6f.pdfIn PDF document text
    • http://hookup753.fun/segopanozeo7m0v.pdfIn PDF document text
    • http://fulukegoror.getenjoyment.net/zexowuwupedabekimasaduwiv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477629/normal_6002029c679b5.pdfIn PDF document text
    • http://ridunculus.com/razoruxowajuwowofugufubr82r.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/14732395-7065-46f7-a4c3-d89fa1cbc2af/rider_waite_tarot_cards_amazon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a2ecc71-e133-495e-b251-9ae53981822a/77524377097.pdfIn PDF document text
    • https://s3.amazonaws.com/xufaxoferugod/78913326183.pdfIn PDF document text
    • https://s3.amazonaws.com/tufitijinexu/55872468249.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/542de6c1-7fef-4fbe-8a98-4cc72176ffae/13386882008.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca2ead9b-3965-4012-97ba-5e42d20321b9/fluval_305_filter_set_up.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/975f85b1-90f3-4e9c-9726-f283cb1b0289/fekegilinokiz.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB91 5520 bytes
SHA-256: 48785490dd1580d54e873f194bd408897a3472ce570440c6ca24fc0142e33587
font_01_sfnt_off0000ee43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE43 13576 bytes
SHA-256: 61f256a86d52a42f35e991f120f27b90cbee59cbac66c103d957dfd8b0832e41
font_02_sfnt_off00011a1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A1E 16144 bytes
SHA-256: 2a5f1667c2e343500efde63e3dd6a136498333968b1680966ac5eb34589f1174