Malicious PDF — malware analysis report

Static analysis result for SHA-256 786d1a8fdaefc649…

MALICIOUS

PDF

67.3 KB Created: 2020-12-18 01:00:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: bea5ccb55e3e1f4040bb38a024619596 SHA-1: ec2d1fb4e415b3b693faa1beb0d938b403a2b8fb SHA-256: 786d1a8fdaefc6493f7ddf21b5730030c14f3834f8311e323ee8a787e4b45cd4
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical alert for a link farm and a high ML score, indicating malicious intent. The embedded URLs and the PDF structure suggest an attempt to direct users to potentially malicious or deceptive websites. Although no scripts were explicitly extracted, the PDF format itself can embed JavaScript, and the overall structure points towards a phishing or SEO manipulation scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafftec.ru/123?utm_term=jupyter+notebook+manual+pdf PDF link annotation
    • https://supavutoni.weebly.com/uploads/1/3/4/7/134713891/viwanosin-sikolixetatera-lerumijirov.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413011/normal_5fa9ad02f3186.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379029/normal_5f8b13d194bb1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388293/normal_5fa2ed627b467.pdfIn PDF document text
    • https://fupefasupemeze.weebly.com/uploads/1/3/4/3/134315788/jaribipexi.pdfIn PDF document text
    • https://rojusonevupa.weebly.com/uploads/1/3/0/8/130814232/powaxorisavasar.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/wifiduxezo/functional_specification_template_sap.pdfIn PDF document text
    • https://s3.amazonaws.com/zinudipir/33231143854.pdfIn PDF document text
    • https://s3.amazonaws.com/lovetijif/ginuburarofatabefofomibep.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5af5f12facd59cecdbb78/t/5fd6b5b47fc52c2069319c56/1607906742098/ms_powerpoint_2013_templates_free.pdfIn PDF document text
    • https://s3.amazonaws.com/dazifozixawus/14181814653.pdfIn PDF document text
    • https://s3.amazonaws.com/wufujudisu/allana_pratt.pdfIn PDF document text
    • https://s3.amazonaws.com/baposivarabuj/bufaxuzojezatepufuton.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_off0000c938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC938 5304 bytes
SHA-256: 2d53d40d382f6c7573531ad4759978b47e2296e48c754bfc5819af6ec24f22aa
font_01_sfnt_off0000db36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB36 10992 bytes
SHA-256: 202c306d11834ce6ed8bb92e5c1e8c70cf0c8e36d553b3b8337b760188658ee6

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