Malicious PDF — malware analysis report

Static analysis result for SHA-256 e477ec3c22615067…

MALICIOUS

PDF

76.8 KB Created: 2021-05-16 16:05:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 24ffb150db95658e9b74d2fd47bf1278 SHA-1: ae940b1e02e288c8f363677bf14604db70b50955 SHA-256: e477ec3c2261506786a74bee3f19aba9be579e0138db86cec4d0282568ccc4f7
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, many pointing to other PDF documents, suggesting a link farm or SEO manipulation tactic. One of the primary external links is to 'seumenha.ru', which is suspicious. While no scripts were explicitly extracted, the PDF structure and the presence of external links indicate a potential for malicious redirection or content delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=little+red+riding+hood+short+story+in+german
    • https://bopamoverera.weebly.com/uploads/1/3/1/4/131408256/23cb03b725c.pdf
    • https://cdn-cms.f-static.net/uploads/4485927/normal_606cd0f0c9a17.pdf
    • https://cdn-cms.f-static.net/uploads/4482407/normal_60177f2474154.pdf
    • https://cdn-cms.f-static.net/uploads/4449775/normal_6060fce6056b8.pdf
    • https://cdn-cms.f-static.net/uploads/4480891/normal_606a4f3667586.pdf
    • http://fuvagezilavez.mygamesonline.org/fakaluvodirigivedapanime.pdf
    • https://wotowabe.weebly.com/uploads/1/3/4/6/134688823/8161474.pdf
    • https://cdn-cms.f-static.net/uploads/4500679/normal_5fd9371f6a6fb.pdf
    • http://wozupabalaviv.medianewsonline.com/how_to_update_samsung_tab_4_to_lollipop.pdf
    • https://static.s123-cdn-static.com/uploads/4378848/normal_5fee136a5ea3f.pdf
    • https://nedetuvozuwe.weebly.com/uploads/1/3/4/6/134699612/jezipoxi.pdf
    • https://cdn-cms.f-static.net/uploads/4420020/normal_6066e1107576c.pdf
    • https://nenikekawudiw.weebly.com/uploads/1/3/4/4/134468161/xatokutiloximedapaz.pdf
    • https://cdn-cms.f-static.net/uploads/4503197/normal_5fe950ebea3cc.pdf
    • http://kugaraginoja.mypressonline.com/biological_science_freeman_download.pdf
    • https://kapojisu.weebly.com/uploads/1/3/2/6/132696117/6263305.pdf
    • https://static.s123-cdn-static.com/uploads/4444102/normal_5fe5500f5e15d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/bd905ecc-64ad-4e57-a09a-2cbea0c66440/essay_about_marshall_mcluhan_the_medium_is_the_message.pdf
    • https://uploads.strikinglycdn.com/files/def244e7-f748-4ac8-a1c7-378d7f8614b8/kirunesovomupekona.pdf
    • https://uploads.strikinglycdn.com/files/a0fcf16d-0085-4eba-a0de-d1a7cb19f05f/casio_tough_solar_illuminator_user_manual.pdf
    • https://s3.amazonaws.com/rebomedug/35209168120.pdf
    • http://xurosuforudev.atwebpages.com/83595918068.pdf
    • https://s3.amazonaws.com/vunizi/tomuzexubajivuselave.pdf
    • https://s3.amazonaws.com/bufipevuril/kilizove.pdf
    • https://uploads.strikinglycdn.com/files/6c030e45-5053-49ea-8956-14d41ef09488/vejuwixemugujitutefa.pdf
    • https://s3.amazonaws.com/borokegujuzero/7133373607.pdf
    • https://uploads.strikinglycdn.com/files/450bbcc2-5d44-4e48-9b40-5f7b23aed234/59413424851.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed19.bin
5f18e0910a5b7b8716eb315621fbc313883c93d8bf133fe3417d7830964320f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED19 5280 bytes
font_01_sfnt_off0000fee1.bin
efa3d65432d214f6bb394cf856188db27abbf363589c5d1b93c4e16f829c463e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE1 11428 bytes

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