Malicious PDF — malware analysis report

Static analysis result for SHA-256 14d256c53072614b…

MALICIOUS

PDF

82.4 KB Created: 2021-04-13 23:02:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e1af195f396a70926e848d075fc63f13 SHA-1: cbedbb0ffde2225591c957833c78264c03615c30 SHA-256: 14d256c53072614b1aaf9e67c192a0080b6d9e3243dd761de5ead3e4bd458aae
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of an SEO link farm designed to redirect users. The primary redirector URL, 'https://druttle.ru/strik?utm_term=ryobi+1700+psi+pressure+washer+gun', is identified as a high-risk element. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://druttle.ru/strik?utm_term=ryobi+1700+psi+pressure+washer+gun PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4466408/normal_6029af7a7d4c0.pdfIn PDF document text
    • https://kaperimivegorew.weebly.com/uploads/1/3/4/3/134371305/978b038b7f6cd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480173/normal_60074edca6b8a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474985/normal_604f3009040be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502721/normal_606e71d07db96.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450625/normal_603d0965dec20.pdfIn PDF document text
    • https://vuginavoji.weebly.com/uploads/1/3/0/7/130775358/ef02bd912b0c3a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405440/normal_606e6f95bd09d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416789/normal_5fddc7e2adef8.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://aa4de0c4-a7fb-47f6-97fe-5721705e71c1.filesusr.com/ugd/824332_9d388da59b194f2493fdddabbd9f0d9c.pdf?index=trueIn PDF document text
    • https://91c7bc9f-df77-4dbd-ae51-8bcf521f3e61.filesusr.com/ugd/1df9ea_a4ed9afa574142279d7a2c98f9921639.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/firigugixujotov/is_there_a_follow_up_to_lost.pdfIn PDF document text
    • https://s3.amazonaws.com/wajibile/new_bollywood_song_2019_ringtone.pdfIn PDF document text
    • https://2a403a33-5f6e-4534-96f9-742aa7325afc.filesusr.com/ugd/d2da83_a7f9dd33bda64904b4cdf2092eed0194.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/how_to_make_a_rangers_apprentice_cloak.pdfIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/maths_solver_app.pdfIn PDF document text
    • https://e79dab91-b8ca-4f03-a7cf-74564eaa1d8a.filesusr.com/ugd/009cd4_d163b5f3b65f463ea485c7e0dd31b22c.pdf?index=trueIn PDF document text
    • https://82e7f058-9c2a-4352-8e65-a162d98cde11.filesusr.com/ugd/ba3c76_82907fc4ea694fcb93b61d2c7a3188a4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xuzakob/tobozekomiwa.pdfIn PDF document text
    • https://s3.amazonaws.com/pazatuv/trig_identities_triangle.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_off0000f623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF623 5468 bytes
SHA-256: ef2866956ddc9085f5db892231f0020761a4d87538dc6a0489e213c22b56b9f9
font_01_sfnt_off000108c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C0 11124 bytes
SHA-256: 06724225d80a62b0be118bbb348fef90e9409b2046c7c6c0abb2778d688c4cc4
font_02_sfnt_off00012e19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E19 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34