Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c4caf5f4a458b4c…

MALICIOUS

PDF

73.9 KB Created: 2020-11-25 04:36:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: e34436bf574c8fad7e8d91415826ac45 SHA-1: b90ef8d41ddce4ab911c6586dd1b778c03ec377c SHA-256: 3c4caf5f4a458b4ce996f2e37c8e1afe59850939bb31cdb8747dcc931f534e05
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a phishing or SEO manipulation tactic. ClamAV and ML classifiers strongly indicate maliciousness, specifically flagging it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and link farm heuristic point towards malicious intent, likely to redirect users to harmful sites.

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://traffking.ru/strik?utm_term=st+vincent+de+paul+thrift+st+augustine PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4376371/normal_5f8c3ea5b149b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471719/normal_5faf3de34310f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387939/normal_5fa31d9b3556f.pdfIn PDF document text
    • https://wigadanoj.weebly.com/uploads/1/3/4/4/134404864/kubabaveruxo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459321/normal_5fb689f7ca0c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404529/normal_5f9775bbd7f1a.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/dolopitubolagu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368229/normal_5fb2b843653de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415065/normal_5f95d2be7df6a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408176/normal_5f9b9a8086d74.pdfIn PDF document text
    • https://wefamojugibe.weebly.com/uploads/1/3/1/1/131164519/zemobifi.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/rokuwapesu/26768920336.pdfIn PDF document text
    • https://s3.amazonaws.com/lokijuronig/gebidibe.pdfIn PDF document text
    • https://s3.amazonaws.com/genedonapubefe/gojode.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_off0000da05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA05 5580 bytes
SHA-256: b2179ca4abaa51306a7cc61e4f06ff0d92a22e4015b34c4ad9d5d9d1e23b072b
font_01_sfnt_off0000ecf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF5 1936 bytes
SHA-256: 4fd3cb50c8928ad5b4530346788e3f6d1a186e35ff400b9671f8fcf5eb292fbb
font_02_sfnt_off0000f640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF640 10596 bytes
SHA-256: 090912db8282b59ede9014d26caa052fa89ee1472f415cc809d6bbd342e9fd2e

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