Malicious PDF — malware analysis report

Static analysis result for SHA-256 33adacb1e1a77d02…

MALICIOUS

PDF

94.1 KB Created: 2020-11-10 04:54:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: b604db7641eee02d0133ef9fa8170ec6 SHA-1: d38605cf04f072f14818f2a10191e7ac9a400f8e SHA-256: 33adacb1e1a77d02c81317b69434fe6f62d0a3b787787adb6fdf26db8175247b
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 0.9807

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://traffset.ru/123?keyword=ap+euro+otto+von+bismarck+dbq PDF link annotation
    • https://ratowoxure.weebly.com/uploads/1/3/4/5/134584599/3961807.pdfIn PDF document text
    • https://dizawiwutap.weebly.com/uploads/1/3/4/6/134629961/femabuvepisesipe.pdfIn PDF document text
    • https://sivikowililip.weebly.com/uploads/1/3/4/5/134599649/bb5cdf40b6.pdfIn PDF document text
    • https://mawanegofarate.weebly.com/uploads/1/3/4/4/134466522/zitutel-fitedajeda-laweduboxe-lagixaput.pdfIn PDF document text
    • https://nowusunomotir.weebly.com/uploads/1/3/4/3/134314498/25c15fd3610283.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://uploads.strikinglycdn.com/files/1b95ee99-a9e6-456e-a391-5193f66beb20/valurulor.pdfIn PDF document text
    • https://s3.amazonaws.com/zufaxepixiguxax/action_and_linking_verbs_quiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6d03c07-d1c0-4ecd-9880-935a91433289/xuvanazexunakuxemave.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f963ef1-5a16-4d1c-8093-435adfac456b/26268900499.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA04 6716 bytes
SHA-256: 9777ffdf162a987201df36bd46ce74e5f99e5fbedc0613874cb9c4be33e18d9b
font_01_sfnt_off0000faf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF1 5448 bytes
SHA-256: 74b600d1027a348c6d9ee37046f6f9ab47b1b6325757445b05ae5ad88a15f04c
font_02_sfnt_off00010d51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D51 4564 bytes
SHA-256: 5987ae7c8d84c53cfd63882761d5c645642728857504d84eef02faebd16b3fbc
font_03_sfnt_off00011eb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB6 11888 bytes
SHA-256: df7fd36c6532b63f784ba3aa7d3a0fdd14641e3962964c82fd3aca153462928b
font_04_sfnt_off0001456b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1456B 16328 bytes
SHA-256: 2a86019e7aedf532bec3541e4114c927aa85d2fc184e9fc7677f620147bb2d28
font_05_sfnt_off00015b26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B26 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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