Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e3f9981b8fe038b…

MALICIOUS

PDF

79.0 KB Created: 2020-11-23 15:17:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: f6c2326c178c0be1e6d3f289995f4080 SHA-1: 65666015fbec23a71f5e91d088223d74edd4fb0b SHA-256: 7e3f9981b8fe038b167c1947cf789cca07fdc991acf68625a16c21920bda4674
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains text related to 'wkhtmltopdf', suggesting it might be a generated document used for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://traffmen.ru/strik?utm_term=polegadas+a+milimetros+tuberia+elect In PDF document text
    • https://tadeganerusoza.weebly.com/uploads/1/3/1/4/131438541/272418.pdfIn PDF document text
    • https://xekadefu.weebly.com/uploads/1/3/4/5/134597434/torutamoluma.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414495/normal_5faf89bd83b03.pdfIn PDF document text
    • https://jegupifak.weebly.com/uploads/1/3/4/0/134018348/8468037.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446765/normal_5fb2edcb47a0b.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://uploads.strikinglycdn.com/files/bf7cf43c-5368-447b-b122-66b09d67fb06/sezudenewanole.pdfIn PDF document text
    • https://s3.amazonaws.com/mavixu/wetisekabulunisowuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/224bba95-642c-4c81-ad3c-1df5e5a388f0/21471086756.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/66076514387.pdfIn PDF document text
    • https://s3.amazonaws.com/takebemanijewok/10970700113.pdfIn PDF document text
    • https://s3.amazonaws.com/fulomufimikim/xanoramidorema.pdfIn PDF document text
    • https://s3.amazonaws.com/nokiva/cyanogenmod_12._1_grouper.pdfIn PDF document text
    • https://s3.amazonaws.com/sefipa/9719108386.pdfIn PDF document text
    • https://s3.amazonaws.com/wenobagupexekap/nimunogosawesivunumadil.pdfIn PDF document text
    • https://s3.amazonaws.com/wukevirenesu/kigak.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_off0000eb95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB95 5176 bytes
SHA-256: 492d77936a8096486c08c6014f9b67c0c93ccef058b2925234f8f0336049df6f
font_01_sfnt_off0000fd30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD30 10424 bytes
SHA-256: cd92164944b619a027f43d53dd5df867528a6b43c56c9677a23169e8e0a10c27
font_02_sfnt_off000120e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E7 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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