Malicious PDF — malware analysis report

Static analysis result for SHA-256 1335707a66742b65…

MALICIOUS

PDF

77.7 KB Created: 2021-01-11 17:38:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: ec6a5f81583f16c7e9a0e9575917db01 SHA-1: d5574d76f7d312270381d4c8adbbcf650d3f7907 SHA-256: 1335707a66742b659a44f2a5decb1733f964dd88855a6ad7f3b732c46b0f9879
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, many pointing to S3 buckets, suggesting a link farm or SEO poisoning attempt. One prominent URL, 'https://traffking.ru/aws?utm_term=bncc+atualizada+2018+em+pdf', is flagged as unknown reputation and is likely malicious. ClamAV detection and ML classification further support the malicious nature of this PDF, which is likely used as a lure in a phishing campaign.

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/aws?utm_term=bncc+atualizada+2018+em+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4454982/normal_5feb19172d1d0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381737/normal_5ff2cc362dd41.pdfIn PDF document text
    • https://cdn.sqhk.co/mepowokugo/icgcZkB/82527834330.pdfIn PDF document text
    • https://cdn.sqhk.co/vilomikov/Xmighih/38661057905.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374207/normal_5f89e14e7fc3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365626/normal_5f87fe0314598.pdfIn PDF document text
    • https://cdn.sqhk.co/xotabuti/jggihc8/xejinifo.pdfIn PDF document text
    • https://napudipeludade.weebly.com/uploads/1/3/4/3/134344161/36685640721.pdfIn PDF document text
    • https://xurizuful.weebly.com/uploads/1/3/4/8/134898541/bimiturixavale.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/lemefofutomapox/83696301324.pdfIn PDF document text
    • https://s3.amazonaws.com/juduk/2009_chrysler_pt_cruiser_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/zasepo/aggarwal_college_ballabgarh_admission_form_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/vesubodufisi/informational_interview_linkedin_template.pdfIn PDF document text
    • https://s3.amazonaws.com/lumixi/24822470560.pdfIn PDF document text
    • https://s3.amazonaws.com/takateg/album_app_free_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagoba/descriptive_writing_words.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

Related samples 6

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

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF282 5648 bytes
SHA-256: 2336d341c7dcaa7854df81d695ee0dc270d6fd3154bb24225a4aa240d9cae7b4
font_01_sfnt_off000105b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B9 10412 bytes
SHA-256: 780b1372ad5559150da4430b8391849b7790a3369770603c03b8c7a1befa438d

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