Malicious PDF — malware analysis report

Static analysis result for SHA-256 c90f1f0472d33867…

MALICIOUS

PDF

70.9 KB Created: 2020-11-10 05:49:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 0d6b2eb6168ad30999424be9f651dbeb SHA-1: 1801d3754fadff184ec10aa402f39ae4f7c89e98 SHA-256: c90f1f0472d33867ec933436ab2e89ec29bfaa6b272badc1d1030c6ed4e4459d
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains references to 'Fruity Loops manual' and 'wkhtmltopdf', likely a lure to direct users to malicious URLs for further exploitation.

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://trafffe.ru/strik?keyword=fruity+loops+manual PDF link annotation
    • https://kenodajeto.weebly.com/uploads/1/3/4/4/134490943/bb39f86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375909/normal_5fa5e6b42d2c3.pdfIn PDF document text
    • https://pedesidava.weebly.com/uploads/1/3/4/3/134355179/zitebomivibej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408713/normal_5fa0768bf2608.pdfIn PDF document text
    • https://bilewobadazape.weebly.com/uploads/1/3/2/6/132695578/3cb8123f33c700d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389355/normal_5fa4142023a5d.pdfIn PDF document text
    • https://gipivibeg.weebly.com/uploads/1/3/4/3/134341606/wakupuwogimeloze.pdfIn PDF document text
    • https://dafufiwe.weebly.com/uploads/1/3/4/3/134368649/kazaku-jebibamaxa-gufinatuguvobu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452373/normal_5fa9ab90dce01.pdfIn PDF document text
    • https://vilukenuxe.weebly.com/uploads/1/3/2/8/132814007/volisilitij_luperodebif_vaxulaxolirid.pdfIn PDF document text
    • https://zigifivabukom.weebly.com/uploads/1/3/4/4/134460242/naxaverame.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/gajejasa/stardew_valley_how_to_see_scarecrow_range_switch.pdfIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/baguka.pdfIn PDF document text
    • https://s3.amazonaws.com/sefiwegegagu/puncher_and_wattman_poetry.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_off0000da10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA10 5020 bytes
SHA-256: b0db0a360a447f1ff1d7fff0660afc7d7aa1a324a0aca2f8d02e84e5fd225380
font_01_sfnt_off0000eb0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0E 10368 bytes
SHA-256: 542f39e8ec3da18f73d9bd22f703877f1ae60bd83f88f0a5f3dacd21d2343309

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