Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc3ca34283784905…

MALICIOUS

PDF

76.2 KB Created: 2021-03-28 16:00:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 33573d2af35c87e7a3c52d5dd2a9fb31 SHA-1: c71ce0832c803d666ab6bae82899c39607863970 SHA-256: cc3ca3428378490509d3ff647b4a57852de86229e8262f9dffc3afc57465c147
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to SEO-optimized PDF files, suggesting a link farm or phishing operation. The primary malicious URL, 'https://dugedepap.ru/wix?keyword=drag+racing+streets+mod+apk+2020', is presented as a lure for a game mod download. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dugedepap.ru/wix?keyword=drag+racing+streets+mod+apk+2020 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4412408/normal_5ff6531fca8ab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421056/normal_5ff1776adea8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465539/normal_5fe7ecfc76654.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426830/normal_5ff314b7e2f68.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446285/normal_600284287b6ed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408601/normal_6003b54b26800.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378164/normal_5fc7ff9869973.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389599/normal_600189f90f935.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480744/normal_5fdba9d981257.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471250/normal_5fe8c6a9606d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481417/normal_600c20b029a74.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ed59cdd8-0d75-4634-8bb2-7afdb9da103e.filesusr.com/ugd/9cb112_1817a29cdb864d299593460eda7ed55d.pdf?index=trueIn PDF document text
    • https://ab25a8b3-4d80-4d4b-93a1-c1347014fa7c.filesusr.com/ugd/8d0191_9fe00bfadf6b43ac9b7d14bf388fec39.pdf?index=trueIn PDF document text
    • https://636e06b3-920c-4898-b827-ef778bbbc101.filesusr.com/ugd/40512e_5feab162c7a342e891a67cbb9123525f.pdf?index=trueIn PDF document text
    • https://6b551870-9d71-4c88-87ac-30bafd697196.filesusr.com/ugd/b27e13_83228f70d5e549318eb453f215cf7e92.pdf?index=trueIn PDF document text
    • https://28932ed2-21d9-4123-99cb-fcff0aac4472.filesusr.com/ugd/cc089a_7bdcbfe67fb14de7abb8439f909e16ad.pdf?index=trueIn PDF document text
    • https://e668d0bc-6b9c-4787-ac64-5363b724ef62.filesusr.com/ugd/6ec699_e423f563806e4e77a2acfd48020d2039.pdf?index=trueIn PDF document text
    • https://4abf464d-34d5-4c80-8de5-e64f30e04530.filesusr.com/ugd/8b3eb5_501e33678fb042f2b20bdcab05d0ba4a.pdf?index=trueIn PDF document text
    • https://2a009ac4-5770-49f2-ae16-4ce107243443.filesusr.com/ugd/59deca_56762298cb4c4b6da24c4352499438a6.pdf?index=trueIn PDF document text
    • https://a86a6b26-b473-4b55-b9aa-7628a2bff077.filesusr.com/ugd/4f270c_9aa4b1787efb447ba53661b045640895.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC50 5696 bytes
SHA-256: ad2d335d50e61a498708774190aee19d764fbf682265a04f1e867fbc6135383c
font_01_sfnt_off0000ffab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAB 10464 bytes
SHA-256: ff033118070ea0649027d78b23d25bc1aa585e8ade4ca5725342c4d82630a0c5