Malicious PDF — malware analysis report

Static analysis result for SHA-256 57d8d794c4076c2c…

MALICIOUS

PDF

72.9 KB Created: 2020-12-10 09:34:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: c99c0a794a85220dcf37641bffab0a89 SHA-1: 11df865388829970076a412eacedf9cc15c7b5c1 SHA-256: 57d8d794c4076c2c1bca6c02f99f5190a658d36dd6488b4f57c866841c633dd7
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 0.9997

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://trafftec.ru/aws?utm_term=convenios+de+ginebra+pdf PDF link annotation
    • https://talupujepanuzan.weebly.com/uploads/1/3/4/5/134595677/negulelarevef.pdfIn PDF document text
    • https://papunagaku.weebly.com/uploads/1/3/1/3/131384156/xujoko.pdfIn PDF document text
    • https://fawurefo.weebly.com/uploads/1/3/4/4/134441885/bd4449939d61.pdfIn PDF document text
    • https://masejufubalabej.weebly.com/uploads/1/3/4/3/134388341/f25767e63db37f.pdfIn PDF document text
    • https://buvitefano.weebly.com/uploads/1/3/4/1/134131500/daguburulazotituwu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383579/normal_5f8cb6dbef9e9.pdfIn PDF document text
    • https://dexetejitifite.weebly.com/uploads/1/3/4/5/134576896/nepitibemelodune.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405202/normal_5fc0319c6745b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383807/normal_5fa7848ddf666.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://static1.squarespace.com/static/5fc5355c24b06a7eb31bb18b/t/5fcefde957846c5b834bc809/1607400937250/diy_camo_dip_with_spray_paint.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd1b125e198d0a38648070/1606228754926/11070055212.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc31c7792c50b1a1e85f0fa/t/5fd1a13dd97b572b89d6a828/1607573826717/credit_card_scanner_android_github.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_off0000d4ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AD 5108 bytes
SHA-256: 87ee7123a527ebf3e09d2ab3b0466b819d8fc3d370f656b942b51fe1301121da
font_01_sfnt_off0000e615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE615 10568 bytes
SHA-256: e7f170c53c861ce9dd0bbf1befd7d1ead74e285922f71c466a22ae7865bbbf03
font_02_sfnt_off00010885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10885 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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