Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8e1f9077614ee75…

MALICIOUS

PDF

89.7 KB Created: 2021-03-05 06:01:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 79b9be023a97a2edf8dea91f12d8b974 SHA-1: 0bca7e75d312d454897940b4e8658f8ccb3d6e15 SHA-256: f8e1f9077614ee75b8d2a91e236f762a7f3eaf248e0f472859d5d0bce378b8c2
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 pointing to other PDF documents, suggesting a link farm or SEO spam campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://nipisod.ru/award?keyword=half+blood+prince+book+summary PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4413976/normal_6000d01c40897.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385869/normal_60400b885a4fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444649/normal_6015c19739fbb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386620/normal_602c3d8327b86.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498882/normal_6008ea0cc00ea.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409607/normal_6007d5bf00182.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424043/normal_5ffa3d55bcc71.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403940/normal_5fc8543b28d2b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369777/normal_5ff8540ebd666.pdfIn PDF document text
    • http://rutiputi.22web.org/vampire_diaries_season_1_trailer.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411932/normal_6008c069309ad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465147/normal_5fc80b7a348c6.pdfIn PDF document text
    • http://rafuzigukogare.22web.org/illustrator_web_design_grid_template.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412778/normal_5fce1720c2bea.pdfIn PDF document text
    • http://dusosax.66ghz.com/tezefesiwibine.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447903/normal_5ffa0a02c2489.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fetalinato.epizy.com/uc_browser_mini_free_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/zuguvoxoki/anorexia_y_bulimia_trastornos_alimentarios.pdfIn PDF document text
    • http://wejegekobo.rf.gd/wifoxitoxif.pdfIn PDF document text
    • https://6525eaf8-9a42-4119-9fb4-c3d475b3b78e.filesusr.com/ugd/80bfa9_b3b8382c18fe4c099010bb1ebd005203.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zafaronivaj/49092045145.pdfIn PDF document text
    • https://0e67983c-e844-40c9-b604-97311ec94efe.filesusr.com/ugd/6e13d9_d1b32e04eaf348a5b0bb9dddf75a751c.pdf?index=trueIn PDF document text
    • https://cd489911-dc6d-4439-b408-84622343fb93.filesusr.com/ugd/d8e941_6552c84782244fb594e6bbfd2e8783e5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/loranoduzuja/logo_quiz_answers_level_12_by_bubble.pdfIn PDF document text
    • https://s3.amazonaws.com/jeworurowam/giwatusosuwitik.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_off000122c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C8 5568 bytes
SHA-256: 4b535ca51bd208339d9d084fe865982d95c71a2b059567bece0ddb6642b3019b
font_01_sfnt_off000135a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135A6 10456 bytes
SHA-256: 4dbfd1d24fe7ed6b232b2daa6365aa08c8cb9292d7a5b969be2e152eccb5fcba

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