Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a7c6c6b84dd1c67…

MALICIOUS

PDF

82.7 KB Created: 2021-05-24 23:19:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: f67acff6ebe70d021748b8a947d1ebdd SHA-1: 092d831e6690289aafffd2f09d0366619ff7fb6b SHA-256: 9a7c6c6b84dd1c670599f0315afb14beeaa216cf89eb03f0a86bacbb27cab83d
186 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The embedded content, though heavily obfuscated, suggests an attempt to disguise the malicious nature of the document and lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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 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://vilenefex.ru/strik?utm_term=%25E2%2580%25A2+poder+general+para+actos+de+dominio+o+de+administraci%25C3%25B3n PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4492529/normal_5fcd654a67ce0.pdfIn PDF document text
    • https://taleputara.weebly.com/uploads/1/3/4/3/134305900/vejutige-xejej-nupavasipojenik.pdfIn PDF document text
    • https://lafajadisevo.weebly.com/uploads/1/3/1/4/131454770/ed10a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483837/normal_6068022ecfb1f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367667/normal_5fd7d20770516.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374545/normal_605c61c4988c6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401692/normal_5fcdd6f9091b3.pdfIn PDF document text
    • https://jexewibovagajuk.weebly.com/uploads/1/3/4/4/134485971/welinixalarusubob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451363/normal_602e7dd270ae2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405922/normal_605b7beaa0755.pdfIn PDF document text
    • https://kemumapuvepuvi.weebly.com/uploads/1/3/4/3/134311950/napiwa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450440/normal_604ff083e2ba5.pdfIn PDF document text
    • https://nawawuxilebop.weebly.com/uploads/1/3/4/6/134679594/xuxitu_razodote_xajaraduva.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383568/normal_6055f6acd202c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462345/normal_60125897dd8b7.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://uploads.strikinglycdn.com/files/7f09cff6-6e66-4ce3-bda7-c521199efad8/88077274272.pdfIn PDF document text
    • https://s3.amazonaws.com/julaxel/python_for_beginners_-_learn_python_programming_in_hindi_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d920e760-95ca-499d-9bf1-0a1f5020fd8f/84009007380.pdfIn PDF document text
    • https://s3.amazonaws.com/vuliwisuwig/computing_formula_mass_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/towutoginadivu/tedatakujagonizedotifim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6af21443-2d95-4e43-99fe-98b7f4b7bb80/17688203811.pdfIn PDF document text
    • https://s3.amazonaws.com/bubodeliza/bloc_quebecois_platform.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43f2d655-ba6a-47ba-84ad-0b1b67c1d513/xasamubejuse.pdfIn PDF document text
    • https://s3.amazonaws.com/xugigabitulu/android_card_view_sample_code.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07ea5dd9-d979-442d-96a7-0bfac499e5e9/what_does_daring_mean_antonyms.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_off0000f518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF518 5288 bytes
SHA-256: 56d708315458c9b86ac7af9210b05c54fbb1dc20ca21f4639671c04c701869f9
font_01_sfnt_off000106b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B7 11612 bytes
SHA-256: a122280e473690b0560228823816ccdde874e4b52197758b493bcbb45efa21cf
font_02_sfnt_off00012c13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C13 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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