Malicious PDF — malware analysis report

Static analysis result for SHA-256 37279a0f1c341f24…

MALICIOUS

PDF

88.6 KB Created: 2020-11-10 23:39:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 43a476fead7cb7cf76ea13e546da3603 SHA-1: 9bf4f9ce41f5500c8985539af77f7158c93ada59 SHA-256: 37279a0f1c341f24439b2f4a47825232d16bb326e2309ef5a545188f33f1046f
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, suggesting a link farm or SEO manipulation tactic, with one notable link pointing to 'trafftec.ru'. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external URIs strongly suggest it's designed to redirect users to potentially harmful websites, possibly as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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?keyword=ad+blocker+for+android+apps PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4484358/normal_5fa9e4c549ce6.pdfIn PDF document text
    • https://dawiganolakegoz.weebly.com/uploads/1/3/4/3/134367714/9061713.pdfIn PDF document text
    • https://lefoxidegej.weebly.com/uploads/1/3/4/5/134526886/2670310.pdfIn PDF document text
    • https://bakigimos.weebly.com/uploads/1/3/4/3/134322269/6054326.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391315/normal_5fa6e5545413d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf0b3668-612b-4909-a046-5a17f471282d/makatufaxolapikufijowuvu.pdfIn PDF document text
    • https://s3.amazonaws.com/bipovoromoj/mazerapafete.pdfIn PDF document text
    • https://s3.amazonaws.com/mefadedosuw/apush_dbq_worksheet_heimler.pdfIn PDF document text
    • https://s3.amazonaws.com/jotizifime/vajitunanuwuzozatov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0d4bfba-dd4d-4a96-8c96-c98f6814d0e8/sovafomupujuvoka.pdfIn PDF document text
    • https://s3.amazonaws.com/radubozufiwo/advanced_engineering_mathematics_10th.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/46794332772.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001001d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001D 5344 bytes
SHA-256: 513be12472e65459f1c10529be4bd37597531ff5192977341b50f3fcf1ec038c
font_01_sfnt_off0001124e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1124E 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off00011adb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ADB 10800 bytes
SHA-256: 1dfe14c369d43e9f380582133852a826ee06d9f9d290c07d62500d1fedccce47
font_03_sfnt_off00013f92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F92 16312 bytes
SHA-256: 975089639afea594160f6daa1ae948ffc4125994d61a9fd32dce02580f7b6b15

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