Malicious PDF — malware analysis report

Static analysis result for SHA-256 15d999557927a0df…

MALICIOUS

PDF

77.5 KB Created: 2021-03-22 09:28:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 11e4dba3bb36c769a999c09b95c9afa9 SHA-1: d4de8fc92d785711f05e2fcf8293abf43d7722c1 SHA-256: 15d999557927a0dfd5236d6f85fe74c6cc0497dab4ce76cdc9b3f6c72db717c7
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://leonvi.ru/123?utm_term=princess+makeup+games+free PDF link annotation
    • https://cdn.sqhk.co/temegolu/ic0ieby/rc_dirt_oval_race_cars_for_sale.pdfIn PDF document text
    • http://letilemugemin.66ghz.com/html_stylesheet_link_example.pdfIn PDF document text
    • https://cdn.sqhk.co/sozodumupof/jap6iaf/74549303386.pdfIn PDF document text
    • https://cdn.sqhk.co/jezuleku/cheF7TZ/sowopozanolil.pdfIn PDF document text
    • https://jamakebowixon.weebly.com/uploads/1/3/4/4/134477175/mesaxawiwanojinina.pdfIn PDF document text
    • https://ximusufupes.weebly.com/uploads/1/3/4/4/134486044/8046458.pdfIn PDF document text
    • https://milorali.weebly.com/uploads/1/3/5/9/135965765/26927fb0bab3.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/kalanejaxutilif/41729811506.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05bd6502-ca0c-487a-87c6-ba63d92c23c6/virginia_woolf_poetry_quotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2ccf950-fe46-4d77-ab31-67ae11a8a41b/vopipum.pdfIn PDF document text
    • http://rovarede.rf.gd/format_code_javascript_notepad.pdfIn PDF document text
    • http://resuzebapaluga.rf.gd/vifowaguvigidagezu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2671b00f-0a33-4d2b-ba68-b899599215e4/47866408220.pdfIn PDF document text
    • https://s3.amazonaws.com/sezewu/3196589851.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa651957-bb78-4dc6-9687-a1457b8a666e/99536433905.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_off0000ee08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE08 5368 bytes
SHA-256: a1d60ddeecb2e2c3ce999a4d22e40243577e13acdbe94a38049f0c27a117c81f
font_01_sfnt_off0001003c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003C 12228 bytes
SHA-256: ce4b8c65a54358850f1f869efd1cd8848330d338e58dd1511846aae99e4af658

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