Malicious PDF — malware analysis report

Static analysis result for SHA-256 b937d8a5aad1c76d…

MALICIOUS

PDF

78.5 KB Created: 2021-02-20 00:24:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: de449c2fe4da5da5288f2c59694caf8d SHA-1: 99708834c582893e899f85e7cac25e4c2da00c98 SHA-256: b937d8a5aad1c76dd5b244979b2092640889ea9ca685e962298d58f5d0db2a05
186 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 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://seumenha.ru/123?utm_term=is+gopro+8+good+for+photos PDF link annotation
    • https://zatofurepodato.weebly.com/uploads/1/3/1/4/131482853/nevifaz.pdfIn PDF document text
    • http://lovumodezubudem.iblogger.org/jufiruguxif.pdfIn PDF document text
    • https://disebaxixifos.weebly.com/uploads/1/3/4/7/134714932/vazal_fawuziforuwa_gevupaweli.pdfIn PDF document text
    • https://legopaxazomunan.weebly.com/uploads/1/3/5/3/135396831/3b212f7ee45.pdfIn PDF document text
    • https://zedodunojoponex.weebly.com/uploads/1/3/6/0/136083391/ef516133d0ff3d.pdfIn PDF document text
    • http://gepatoxax.iblogger.org/95824306702.pdfIn PDF document text
    • https://rogapunuki.weebly.com/uploads/1/3/4/3/134375427/8015430.pdfIn PDF document text
    • https://xidamosu.weebly.com/uploads/1/3/4/7/134707329/gapisizazasitel_xabexojimo.pdfIn PDF document text
    • https://mebotorafegamor.weebly.com/uploads/1/3/0/7/130739377/1be3b.pdfIn PDF document text
    • https://vazanekufom.weebly.com/uploads/1/3/5/3/135322674/4681fd8fedaa.pdfIn PDF document text
    • https://zexirajeroluwub.weebly.com/uploads/1/3/4/8/134848753/6815682.pdfIn PDF document text
    • https://matexofetuboso.weebly.com/uploads/1/3/1/4/131453592/5de69419.pdfIn PDF document text
    • https://nunoperiv.weebly.com/uploads/1/3/1/8/131856708/koxiba.pdfIn PDF document text
    • http://fowatufilomit.iblogger.org/accenture_circular_economy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bovinow.epizy.com/romeo_and_juliet_act_1_review_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/vizegemawokaxe/multiplicative_comparison_worksheets_grade_4.pdfIn PDF document text
    • http://lefarobi.rf.gd/simetibakak.pdfIn PDF document text
    • https://s3.amazonaws.com/siwixomudit/85761325128.pdfIn PDF document text
    • http://kabumaja.rf.gd/54374665048.pdfIn PDF document text
    • https://s3.amazonaws.com/gifiz/zigomo.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_off0000f628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF628 5192 bytes
SHA-256: c3e102d0b5d7c4258eacf263858fe218dfc9f1ad2f89c88864fcfc7cac36937b
font_01_sfnt_off000107d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D7 10420 bytes
SHA-256: 594a1d8dcb4b973f388c4218ac5a9a0908b58dae6f28e58b36e0b46a1c267252

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