Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a416b46f31a738c…

MALICIOUS

PDF

105.1 KB Created: 2021-01-22 23:14:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: babe9c89d72c82f7cdfed795b53e149f SHA-1: 6dcaf5ee7106baad2b2eb17526a20298fd29a9e2 SHA-256: 1a416b46f31a738cb9f497d0cc1f0ed6bc8927af819c08cc4fe5ce30b542d864
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM'. This suggests a malicious intent to redirect users to potentially harmful websites or to manipulate search engine results. The ClamAV detection and ML classifier further support its malicious nature, indicating it is likely a phishing or trojan distribution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://trafftec.ru/123?utm_term=navy+mess+dress+uniform+regulations PDF link annotation
    • https://mutabezikubi.weebly.com/uploads/1/3/4/7/134739743/lewekigutimisadotize.pdfIn PDF document text
    • https://tabutepapuwup.weebly.com/uploads/1/3/0/7/130740025/biwudo.pdfIn PDF document text
    • https://japafapu.weebly.com/uploads/1/3/1/4/131437770/lodexevomixu.pdfIn PDF document text
    • http://remumajisipiv.66ghz.com/career_education_definition.pdfIn PDF document text
    • https://mefimume.weebly.com/uploads/1/3/1/4/131437875/451e9c.pdfIn PDF document text
    • https://sejumajofejopib.weebly.com/uploads/1/3/2/7/132740214/6603407.pdfIn PDF document text
    • https://jowatoziji.weebly.com/uploads/1/3/4/8/134893097/5720609.pdfIn PDF document text
    • https://bukodagunotul.weebly.com/uploads/1/3/4/0/134012399/c7b7b5df6347e.pdfIn PDF document text
    • https://mejodedasebedo.weebly.com/uploads/1/3/4/7/134725949/4446420.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jupoti/cpr_2010_guidelines.pdfIn PDF document text
    • http://detuzojezil.rf.gd/kose_vitamin_c_sheet_mask_review.pdfIn PDF document text
    • https://s3.amazonaws.com/wavunot/aadhaar_data_update_form_telugu.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifumofelu/kipoxadul.pdfIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/access_consciousness_knyv.pdfIn PDF document text
    • https://s3.amazonaws.com/xojafemori/10962838374.pdfIn PDF document text
    • https://s3.amazonaws.com/dixaleko/17613576815.pdfIn PDF document text
    • https://s3.amazonaws.com/sonutopexaramuf/angular_2_form_valuechanges.pdfIn PDF document text
    • https://s3.amazonaws.com/tosevud/blue_heart_emoji_facebook_android.pdfIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/asphalt_8_android_hack_tool.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015c5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C5C 5360 bytes
SHA-256: 042429abc17581ea8fe95ad18cf6bcf0e9f36c0a168a1907d9c715e2fe3a8dfb
font_01_sfnt_off00016e96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E96 12620 bytes
SHA-256: 127158221e8319fe46acf155c88f34d26e1627b5fcdcfaf5cc911dbae72ed87c

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