Malicious PDF — malware analysis report

Static analysis result for SHA-256 2afa7a4e2d0b0efe…

MALICIOUS

PDF

122.7 KB Created: 2020-12-03 06:06:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13da96a9ea5f0df66d1bce95f120bb80 SHA-1: bd6534cbd2e46e1926425d55d30d21ed2286742e SHA-256: 2afa7a4e2d0b0efe4d8362aec441ec144a3580eda6811882b9b4de2ccb49a4f2
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to link farms or redirectors, indicating a phishing or malicious redirection attempt. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the presence of embedded URLs and the PDF structure suggest an attempt to lead the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://cctraff.ru/wb?keyword=lake%20blackshear%20crappie%20fishing%20report
    • https://letazofuwukuge.weebly.com/uploads/1/3/4/8/134869061/ddd25f.pdf
    • https://zupuxugemewizo.weebly.com/uploads/1/3/4/3/134309945/8878dc8af.pdf
    • https://zufakuka.weebly.com/uploads/1/3/4/3/134343409/lunijasumejuze-nugiwimod-kapoji-nevevedive.pdf
    • https://cdn-cms.f-static.net/uploads/4369654/normal_5f87d9b0f0fd9.pdf
    • https://letezinujafi.weebly.com/uploads/1/3/4/9/134901841/rapevejix.pdf
    • https://jovapotokuxeb.weebly.com/uploads/1/3/4/8/134881142/tugedu-tuzon.pdf
    • https://medizagokitoni.weebly.com/uploads/1/3/2/3/132303310/1396268.pdf
    • https://bamaxasujobuz.weebly.com/uploads/1/3/4/3/134315865/raziwubat-sewelewefol.pdf
    • https://jajipovel.weebly.com/uploads/1/3/4/5/134527293/5135345.pdf
    • https://cdn-cms.f-static.net/uploads/4381544/normal_5fbe89dc0f609.pdf
    • https://cdn-cms.f-static.net/uploads/4380083/normal_5f8d518e5090c.pdf
    • https://cdn-cms.f-static.net/uploads/4374986/normal_5f89b6216596a.pdf
    • https://tanutefezuje.weebly.com/uploads/1/3/4/4/134437554/ragojopawagi_jidamosebuwajap_xawuxuzegome_nozebawudixi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c6a23261-f583-4592-8e89-3acfb026c165/50851672822.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_off0001a3f2.bin
a91ae45724a5db9d4eaf25ea34cc58b1dd5a7efcb78b377ec7609f4dda7bc9b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A3F2 5420 bytes
font_01_sfnt_off0001b661.bin
64c8495096d6a7fe73cb6184c9e4c4a7de27c45a558a99202b21e3c331b2724c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B661 11636 bytes

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