Malicious PDF — malware analysis report

Static analysis result for SHA-256 82b64ca6e1d3b69c…

MALICIOUS

PDF

70.5 KB Created: 2021-02-24 10:14:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 4edd3344938e6234e951363f3bc2b197 SHA-1: e32b6b9b413c685f3e8181a1d9167491fc40483c SHA-256: 82b64ca6e1d3b69c17f90dfdd49eda4945c4b8b12ec0113371bb1f36defe6e3b
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The embedded URLs point to various PDF documents, likely serving as lures or redirectors to malicious content.

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://maypoin.ru/aws?utm_term=how+do+i+use+my+keurig+duo+plus PDF link annotation
    • https://lokugejepotag.weebly.com/uploads/1/3/4/3/134318746/xekesamozovameg.pdfIn PDF document text
    • http://gojepifega.22web.org/parallel_lines_and_transversals_worksheets.pdfIn PDF document text
    • https://nevidabaxava.weebly.com/uploads/1/3/0/7/130775666/59cb2ba36fc.pdfIn PDF document text
    • https://nejavolezi.weebly.com/uploads/1/3/4/0/134017816/lorixejatologegon.pdfIn PDF document text
    • https://velumosatowe.weebly.com/uploads/1/3/4/8/134883763/a3d28c99a3ce3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449009/normal_5fe77a16ed4c3.pdfIn PDF document text
    • https://ludodufapagita.weebly.com/uploads/1/3/4/6/134616483/1052898.pdfIn PDF document text
    • https://wigewowatabosaz.weebly.com/uploads/1/3/4/3/134352056/4373688.pdfIn PDF document text
    • https://ponigeje.weebly.com/uploads/1/3/0/8/130874529/nifilerigikafi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sonazorapabame.epizy.com/wuxixabinanida.pdfIn PDF document text
    • http://dalefiza.rf.gd/jawepugavajumugakosunus.pdfIn PDF document text
    • http://felixoxajaxev.epizy.com/nizimopituralok.pdfIn PDF document text
    • https://s3.amazonaws.com/diwitapezu/47332654799.pdfIn PDF document text
    • http://talusulimatedo.rf.gd/goldmark_report_nursing_history.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_off0000d5d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D7 5288 bytes
SHA-256: 8b61db2d34becc22ef979c4da469396b5ca19902f2f8f7dcc74f3086c542f54e
font_01_sfnt_off0000e7db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DB 10964 bytes
SHA-256: c0ffc2f0ae96e78f0f1f6282972ce3571a37e841340ef0f0f331cb2f3bd8ee5a

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