Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0ef180aafe9635c…

MALICIOUS

PDF

76.8 KB Created: 2021-01-29 20:16:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: aa703fe73cddd1f3e49b10377082a9cd SHA-1: 54309d47d06108a5eab84b6c1f09387d91f8cc72 SHA-256: f0ef180aafe9635c777a3822448a6a252a947b624bfca95305d4498dd3a2c1f4
196 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to Weebly and other hosting services, suggesting a link farm or redirector strategy. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_UTM_REDIRECTOR_LINK' indicate a high volume of links designed to appear as search engine results, leading to a redirector URL. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://leonvi.ru/123?utm_term=electric+man+3+unblocked PDF link annotation
    • https://timakopazasiri.weebly.com/uploads/1/3/4/4/134445807/gonixevavubelemixuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424347/normal_5feaec824d6df.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391326/normal_600753e5f1303.pdfIn PDF document text
    • https://betewobinolatid.weebly.com/uploads/1/3/4/7/134756009/nedokidolo.pdfIn PDF document text
    • https://kuvinonufero.weebly.com/uploads/1/3/4/3/134307364/4041011.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378852/normal_5fd6548668efd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421473/normal_5fd6e3140cec2.pdfIn PDF document text
    • https://poxatekegevu.weebly.com/uploads/1/3/4/7/134753674/sumewekuwa-kofif-lazopuluwug.pdfIn PDF document text
    • https://fadijugiwekonu.weebly.com/uploads/1/3/1/4/131410939/4546087.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469365/normal_5fe1896c95072.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498971/normal_5fca8fa6311ae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477138/normal_5fecf6943d00a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465704/normal_6009d9a057261.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469645/normal_5fe29d030acf7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://natexekazedap.epizy.com/zunolanarije.pdfIn PDF document text
    • http://setuvufijub.epizy.com/management_organisational_behaviour_notes.pdfIn PDF document text
    • http://kuwademepekipil.epizy.com/case_report_endo_perio_lesion.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD095 7056 bytes
SHA-256: a11b4aa442e5c0f1aa433cce3691acd2cf0c2177e913eb05962fc3368784b2dd
font_01_sfnt_off0000e846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE846 5232 bytes
SHA-256: cd63c3cfe0c2947241ed66fb5b26df5d9f7f21991b8c896387eb82589bf9a42d
font_02_sfnt_off0000f9f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F2 1688 bytes
SHA-256: 9d2b638c5dd3cd3f7096e9cc6f94348a381c44cbe5b9997df3af4c9865379b90
font_03_sfnt_off0001025f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025F 10284 bytes
SHA-256: cdeff8057c5e548bd1266396fd6436b0833aa9ee5288038fcf1b2014ec8877d7