Malicious PDF — malware analysis report

Static analysis result for SHA-256 347fdb51eb905f04…

MALICIOUS

PDF

92.0 KB Created: 2021-04-06 08:14:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 25d05428036489d50c10bcec543ab559 SHA-1: ded16123d1d1c1283c2d67d345d9729949cceb6d SHA-256: 347fdb51eb905f04560bbf7ae3525f585e920f9bc764d041a9353deedbd13c2a
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The document body is heavily obfuscated and appears to contain metadata related to 'wkhtmltopdf', indicating it may have been generated programmatically to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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/123?utm_term=baal+veer+returns+episode+2 PDF link annotation
    • http://ig-copyrightnoticehelp.com/sawipenadegitibxcg8w.pdfIn PDF document text
    • http://fumigatoff.online/806598400647d3rx.pdfIn PDF document text
    • https://rusofejez.weebly.com/uploads/1/3/1/8/131856127/1115204.pdfIn PDF document text
    • http://lotsmen.com/72802119928m1w7c.pdfIn PDF document text
    • http://yatvoyya.fun/pencil_brush_photoshop_cs6hr4s7.pdfIn PDF document text
    • http://ctuxuu.com/vebunewedixotetezemadikh0v1s.pdfIn PDF document text
    • https://fukopimuwevi.weebly.com/uploads/1/3/5/3/135351499/1699206.pdfIn PDF document text
    • https://tifogufa.weebly.com/uploads/1/3/1/6/131637606/gunik-nemovol-wijowepe.pdfIn PDF document text
    • http://repair-monokoles.ru/wopixeruxudi98o83.pdfIn PDF document text
    • http://pipvip.ru/8445160323llhg5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kazupisejurig.rf.gd/pumuzetidita.pdfIn PDF document text
    • http://wuwalumawaj.rf.gd/wodit.pdfIn PDF document text
    • https://f06ae689-34e6-4fd9-b749-a5985747e370.filesusr.com/ugd/4117a9_a24e3aaf22444e668eda8a179a3b603c.pdf?index=trueIn PDF document text
    • https://a519209a-2b0a-481f-9fe9-460c873bdc80.filesusr.com/ugd/270e53_31517921daec4d89971bc4079ee6ca8e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sakaburepagase/sql_code_formatter_eclipse_plugin.pdfIn PDF document text
    • https://7f58a6d3-5723-489e-a2bd-17fd91e1ddd5.filesusr.com/ugd/655495_43fb551165b64917911a64f0e62c72aa.pdf?index=trueIn PDF document text
    • https://1cdd1dcb-54a5-4750-95ad-c4cce9a68cd1.filesusr.com/ugd/1e32c2_e1e2c413a2d04ecd85bb89390e7ac804.pdf?index=trueIn PDF document text
    • https://351e5f87-f9e5-4015-92cd-d601692b9ec3.filesusr.com/ugd/a0d0d3_89b64622258440399b85e2a37a1bc869.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/viromibukoleliw/xobosururuxapogig.pdfIn PDF document text
    • https://s3.amazonaws.com/gofiguj/video_popup_player_apkpure.pdfIn PDF document text
    • https://s3.amazonaws.com/zagapaxa/77209735974.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_off00012c54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C54 5196 bytes
SHA-256: 35d33b5314a895e0809b8ea27c3b376e75a2081364daa1e59fbc3348093e96b3
font_01_sfnt_off00013e16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E16 10784 bytes
SHA-256: 9b4ebab1414313153feb70118baa6762f030dba223bd06ad436817679c1ff60d

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