Malicious PDF — malware analysis report

Static analysis result for SHA-256 0268798ed9e23ab0…

MALICIOUS

PDF

72.3 KB Created: 2020-12-19 16:08:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: ed256c7b863717130328a31a3fd07943 SHA-1: e622d32406c4aa712bf50de599c15ffeece5e89d SHA-256: 0268798ed9e23ab0ea4c20c8730bbaa0b25ec4ef43d5c5f94e93ceb4f3c6e433
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ML classifier and ClamAV, indicating a phishing or trojan payload. It contains a large number of external links, many pointing to S3 buckets, suggesting a link farm designed to distribute further malicious content or host phishing pages. The document body, though heavily obfuscated, contains references to "weather project" and the wkhtmltopdf tool, likely a lure to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://trafffe.ru/strik?utm_term=the+weather+project PDF link annotation
    • https://mekuluvuxagol.weebly.com/uploads/1/3/4/5/134589608/gaburaneseri.pdfIn PDF document text
    • https://zigegawemofeza.weebly.com/uploads/1/3/1/4/131406932/zokotu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/wejuvono/corel_draw_x5_portable_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/sumesawoxajew/rabofivizarexit.pdfIn PDF document text
    • https://s3.amazonaws.com/vazisi/tuwogipegemike.pdfIn PDF document text
    • https://s3.amazonaws.com/savukojubusum/android_tv_launcher_mod.pdfIn PDF document text
    • https://s3.amazonaws.com/tobovunoberiki/kotakidiverobove.pdfIn PDF document text
    • https://s3.amazonaws.com/xeropizuwe/remavizifufudirusivowim.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/eureka_math_answer_key_grade_3.pdfIn PDF document text
    • https://s3.amazonaws.com/wusigipufuvowix/32390744493.pdfIn PDF document text
    • https://s3.amazonaws.com/muxegeza/lohmann_hatchery_management_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/jusuberu/25013961738.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d37c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD37C 4560 bytes
SHA-256: 25f64c6efa4d362a94ba8a624a2e04ddadaafb4d29663c258d9edfbee1b59dc3
font_01_sfnt_off0000e324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE324 10416 bytes
SHA-256: 81a9d4010cefeb74716d5cc632627526212224904ed08f6d9231790cce0dffc5
font_02_sfnt_off000106d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D4 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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