Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf671b4ee165159a…

MALICIOUS

PDF

101.6 KB Created: 2021-03-15 07:49:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 944164aa27966ed9ea369ab20976fa36 SHA-1: 34a75a480f53cdd51dd5230406d187c34c8a3a3c SHA-256: bf671b4ee165159a828b88bf67e412c524a23b035de22ff7cd053b3784ca7e10
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many hosted on disposable domains or dynamic DNS services, indicating a link farm or SEO manipulation tactic. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The embedded URLs likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://seumenha.ru/wix?keyword=thracia+776+guide PDF link annotation
    • https://mopotepawo.weebly.com/uploads/1/3/0/7/130738720/wilenera.pdfIn PDF document text
    • https://cdn.sqhk.co/wupetutigo/Eep8Ahj/27961714080.pdfIn PDF document text
    • http://kuvilawodir.22web.org/fanaratudiradebupeputejon.pdfIn PDF document text
    • https://cdn.sqhk.co/matezafun/gjgieja/naforumijawitamuwijudene.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384037/normal_5fedb8f6dc9bb.pdfIn PDF document text
    • https://xonedapu.weebly.com/uploads/1/3/4/6/134654428/9829276.pdfIn PDF document text
    • https://cdn.sqhk.co/suwuwewazaka/ejcAsZ8/fimag.pdfIn PDF document text
    • https://navubepoma.weebly.com/uploads/1/3/5/3/135394012/98a277.pdfIn PDF document text
    • https://cdn.sqhk.co/rolileduvof/cVSgggf/samsung_internet_browser_vs_chrome.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459320/normal_6036b35361764.pdfIn PDF document text
    • http://soluzixod.66ghz.com/3292515026.pdfIn PDF document text
    • https://jatevabuxises.weebly.com/uploads/1/3/5/3/135382810/vatubap.pdfIn PDF document text
    • https://tekaxudifen.weebly.com/uploads/1/3/5/9/135992886/tiwosuwujozefujuzel.pdfIn PDF document text
    • https://cdn.sqhk.co/xikesurufa/u7ijjcj/amtrak_map_california_san_joaquin.pdfIn PDF document text
    • http://talinab.iblogger.org/caaspp_score_report_2019.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e1bd05e7-a2ed-43df-b5fc-9bc8ee0b1a84.filesusr.com/ugd/08acf3_3fd07748170640cd825320b6f02661af.pdf?index=trueIn PDF document text
    • http://petirepure.epizy.com/xewafofufakemuzebus.pdfIn PDF document text
    • https://63995da9-74be-4895-8497-a4fa53c9845d.filesusr.com/ugd/788c84_413ff65f396c4f8f8e6d0af519920a5e.pdf?index=trueIn PDF document text
    • https://4a31e3f8-49e3-4331-b1a9-c0bb7a6b9dbc.filesusr.com/ugd/599f1c_89471abe2638440fbc88850f3bcc0656.pdf?index=trueIn PDF document text
    • https://1cdd1dcb-54a5-4750-95ad-c4cce9a68cd1.filesusr.com/ugd/1e32c2_16849e40492648b58766253afd981072.pdf?index=trueIn PDF document text
    • https://f499a9ea-5579-4d3c-a180-ba191067f9b7.filesusr.com/ugd/34ec99_c7dbb27f7723460fbb7e44c610e5fd98.pdf?index=trueIn PDF document text
    • https://63d876aa-455f-4c41-9c38-50747f3e0b95.filesusr.com/ugd/a220d5_ae60983561f34801aa0d2057ae4d28d1.pdf?index=trueIn PDF document text
    • http://mimapabu.epizy.com/jason_stephenson_chakra_guided_spoken_meditation.pdfIn PDF document text
    • https://288c7b4b-0494-48f6-8ee2-9dd519b96b0a.filesusr.com/ugd/a107db_b1e840691e884697869c5d6548ca90a7.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001235b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1235B 6560 bytes
SHA-256: e1a10a9c59a3c51806de6ce6b273e32f652167533b0f984706bfd8c2c8733f07
font_01_sfnt_off000139be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139BE 5176 bytes
SHA-256: 347e602366b9fd40526cf61525e17ee7d576f8b74c6da932a52ee8ab2a66f3f8
font_02_sfnt_off00014b56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B56 11320 bytes
SHA-256: cc97dfe2136cbc7ef8a75b27a67faa6033f48f3529c3787be8400d19a2fcf963
font_03_sfnt_off000171b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171B9 16092 bytes
SHA-256: 39b2f4b99ee08965fd4836f89f628a00cde8346cb181131bba0308e80db8fb67

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