Malicious PDF — malware analysis report

Static analysis result for SHA-256 3839a12c68668cab…

MALICIOUS

PDF

125.3 KB Created: 2021-01-16 10:36:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: cbe36fbb24c4e1ca465832ec37760f0c SHA-1: 2bd25e2623130fdfb07ec7c179d8b9527359cb05 SHA-256: 3839a12c68668cab9dd614c4984463060b279e0366f857935b9e9b3b86cabdd6
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 of which point to SEO-optimized PDF files hosted on various domains. This behavior is indicative of a link farm or redirection scheme designed to manipulate search engine results or direct users to malicious content. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://trafffi.ru/aws?utm_term=tubo-+ovarian+abscess+treatment+guidelines PDF link annotation
    • https://site-1172255.mozfiles.com/files/1172255/tuxuloraraxi.pdfIn PDF document text
    • https://zojusuvog.weebly.com/uploads/1/3/4/7/134762677/5e68175347.pdfIn PDF document text
    • https://site-1174481.mozfiles.com/files/1174481/migupatadawemox.pdfIn PDF document text
    • https://site-1230768.mozfiles.com/files/1230768/lukulasejuji.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380528/normal_5ffe3028e3c84.pdfIn PDF document text
    • https://site-1168088.mozfiles.com/files/1168088/putagaki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469359/normal_5fa75a433ba72.pdfIn PDF document text
    • https://site-1175001.mozfiles.com/files/1175001/tiktok_download_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499329/normal_5fd19f4cbfe0e.pdfIn PDF document text
    • https://daxuregivav.weebly.com/uploads/1/3/4/4/134431970/bdb555a.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/ninazarila/algebra_questions_year_9.pdfIn PDF document text
    • https://s3.amazonaws.com/midipes/pifudezumevixasekop.pdfIn PDF document text
    • https://s3.amazonaws.com/tugabijenovili/fugunosuzowofonifivinik.pdfIn PDF document text
    • https://s3.amazonaws.com/jeduzizonox/43965258199.pdfIn PDF document text
    • https://s3.amazonaws.com/pobixedele/wow_mop_mount_farming_guide.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_off00015bc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BC8 20792 bytes
SHA-256: 08f73bde9c633b4ec9f08d696204e7f53186455bf0bb229c3e4b466d0c9bb1ac
font_01_sfnt_off0001985c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1985C 5440 bytes
SHA-256: 4446a97914ae3f845e9056487f6deb64b6cc2d25e9b6b3e411cc414f74563b93
font_02_sfnt_off0001aac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AAC8 11816 bytes
SHA-256: eeaf21c5b2a7b988be067e6aafb6d3e298863d9781ee1a5abdb18b6dd1060b76
font_03_sfnt_off0001d214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D214 16060 bytes
SHA-256: d1a84ba8f0e4a827a048d387db8dd5dae3538f1c7e72415b16af587a9947cdc7

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