Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2b23d727ddde2d5…

MALICIOUS

PDF

67.6 KB Created: 2020-11-19 08:15:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: c6e9218e0254f7f37f1953447c0bbfae SHA-1: d8b2ecc79427e76ff5f0dbf5577a4f0a8758e213 SHA-256: e2b23d727ddde2d518d2c8136ef749024ab5ff7d90e6307edd2949ccf243e9ed
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 0.9998

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://trafffi.ru/strik?utm_term=main+sharabi+cocktail+mp3+download PDF link annotation
    • https://tubenuluni.weebly.com/uploads/1/3/1/4/131437864/vuragana.pdfIn PDF document text
    • https://bekijarodik.weebly.com/uploads/1/3/4/6/134617997/negasezufit.pdfIn PDF document text
    • https://kokurakigid.weebly.com/uploads/1/3/4/8/134866761/3919831.pdfIn PDF document text
    • https://nitetezelimon.weebly.com/uploads/1/3/1/4/131438651/7c9ed9c30c.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/b87914cb-2eef-4220-8a83-c48c29f80e0b/comparative_and_superlative_worksheets_2nd_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a6ee001-7319-4afe-be90-ca4b46d320d8/nururakopovopoba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4626827-dac1-4b43-822b-5255bcaec940/dialogue_with_heraclides.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16dfe833-c38c-4ab2-a2aa-456bd265916c/40584705652.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81c7c267-6376-406d-ba72-088084df965b/89483660598.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30e9c046-04af-4f4b-a853-13f48babbc69/engineering_electromagnetics_inan_so.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5dc01eef-56d5-4e2f-b9c6-7836870489e1/8209766627.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95be10a6-f330-4084-9d43-784db726c27f/what_math_skills_do_scientists_use.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea35a0c3-2aba-47ce-8162-ce173d3634fb/guitar_chord_generator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c5aa9c7-29e5-4f70-be8f-341965396c74/daxakonufufawazupazuvibo.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_off0000c70a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC70A 5776 bytes
SHA-256: 4fbc975ddd0a76fd8f267d6e78ff76ac88168fb13719bb06d4635ee1737cc431
font_01_sfnt_off0000da98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA98 11728 bytes
SHA-256: 1df56ed897c3db7c7352d6333106b4b417c4ebb4864c2f7add231e4cf139274e

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