Malicious PDF — malware analysis report

Static analysis result for SHA-256 05d24d7f2d3d5596…

MALICIOUS

PDF

79.7 KB Created: 2021-05-18 20:40:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 85ab5ba836469401e6d464b36a427b69 SHA-1: 294f2e20b74eee133948b49f87aaef00effe3c43 SHA-256: 05d24d7f2d3d5596f156c3f2a67a0a1de77afe7072f46b98efc1898bd4e91169
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to suspicious domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' confirm the strategy of directing users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://leonvi.ru/strik?utm_term=sims+freeplay+level+55+mod+apk+download PDF link annotation
    • https://kikebepuziji.weebly.com/uploads/1/3/0/7/130775256/023915cf0e118.pdfIn PDF document text
    • https://varowuzogan.weebly.com/uploads/1/3/1/8/131856285/kidoru.pdfIn PDF document text
    • https://tujurexi.weebly.com/uploads/1/3/4/7/134743655/gebogip-tifudas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366369/normal_605dc87e88abd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376096/normal_60290a8e7fa64.pdfIn PDF document text
    • https://tixedasuke.weebly.com/uploads/1/3/5/9/135979549/gijobow_repufozoxiwaze_tejajekesatotek_rofaguxefetenis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413573/normal_60199937553a0.pdfIn PDF document text
    • https://tagewojozupuk.weebly.com/uploads/1/3/4/3/134358966/0dd19419c58f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/pujinit/binary_file_viewer.pdfIn PDF document text
    • https://s3.amazonaws.com/fadobirak/divosolulutiponasuvigawa.pdfIn PDF document text
    • https://s3.amazonaws.com/bulalowisu/90232895160.pdfIn PDF document text
    • https://s3.amazonaws.com/jipowumat/indian_movies_free_online.pdfIn PDF document text
    • https://s3.amazonaws.com/jivagajamav/google_chrome_auto_shutdown_after.pdfIn PDF document text
    • https://s3.amazonaws.com/dujepav/pisememaluf.pdfIn PDF document text
    • https://s3.amazonaws.com/bejokazemur/template_of_to_whom_it_may_concern.pdfIn PDF document text
    • https://s3.amazonaws.com/gaxuremewuger/tumazoxokomad.pdfIn PDF document text
    • https://s3.amazonaws.com/lemerisinivum/zaduvuzifuzovanarajakos.pdfIn PDF document text
    • https://s3.amazonaws.com/fakuguvil/the_roadster_shop_charger.pdfIn PDF document text
    • https://s3.amazonaws.com/pibabopuduj/49666637544.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eacf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACF 5440 bytes
SHA-256: 327dfc07b6311a134f524b1ad7ac482b9d067983ac2cc3cd1af82b641d49abd7
font_01_sfnt_off0000fd46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD46 10580 bytes
SHA-256: 2d1559fd8db29f1e2401719beeaa396a8dc5df52a17fc71475da8bb53bd8fec5
font_02_sfnt_off00012152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12152 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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