Malicious PDF — malware analysis report

Static analysis result for SHA-256 7afc04364c710c68…

MALICIOUS

PDF

59.5 KB Created: 2020-12-06 07:45:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 6ddf5a1b5579d6da168a6b9233534f19 SHA-1: b1cd9d69298629339fa8ba172b26e124010fdac3 SHA-256: 7afc04364c710c683c38febb9e2814374b8ed17b9767003737ea4a36ca2dd54d
156 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 0.9996

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://traffnew.ru/123?utm_term=macbeth+act+2+test+answers PDF link annotation
    • https://gudojovevisepu.weebly.com/uploads/1/3/4/3/134314990/4b73db6.pdfIn PDF document text
    • https://kofenidez.weebly.com/uploads/1/3/4/8/134890612/45ac3f9b3b.pdfIn PDF document text
    • https://pevomoten.weebly.com/uploads/1/3/4/6/134626000/5470655.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e80c054-a827-4651-97ed-2180491810d2/tosinobosavodaxawetip.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxutedi/giburevukik.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e70d1452f90b7fe56088/t/5fc43d0518e72e5fdb5e7744/1606696197861/mount_si_trail_map.pdfIn PDF document text
    • https://s3.amazonaws.com/kefefetafij/fundamentals_of_actuarial_mathematics_2nd_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26e16621-97ea-4710-9c21-b044a42d1348/80876239230.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1818340f1034a5cad2bd6/t/5fc8fd8a1ff8822b30d7809c/1607007628176/micro_pocket_bully_price.pdfIn PDF document text
    • https://s3.amazonaws.com/wutisigila/pewuf.pdfIn PDF document text
    • https://s3.amazonaws.com/pozokimepe/kebudayaan_di_malaysia.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/bitsat_2013_question_paper.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_off0000ad5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD5E 5224 bytes
SHA-256: cb7ab7eef1ddbb5d150afdc9d1a0bc70fcc09e03852dfe607cd1bf2dbb46f2b5
font_01_sfnt_off0000bf3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF3E 10012 bytes
SHA-256: b9819babc70b3da80d464bf4fae88c2f47e75e53a45f2f6e4b072163e0ced930

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