Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9bf7a5c38a7f2bd…

MALICIOUS

PDF

70.4 KB Created: 2020-11-19 03:06:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 15a2d83a597dc6022036a2f6f273fd5a SHA-1: d510c44f152fe91b4ee2442659f1f5ebd13ee2df SHA-256: e9bf7a5c38a7f2bd2da35a6e137c7134d780f5e7af7588f9ec1bb6eb8d739823
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 0.9997

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://trafffe.ru/123?utm_term=chapter+10+the+mole+assessment+answers PDF link annotation
    • https://derigibi.weebly.com/uploads/1/3/4/4/134447264/gefunetuxe-lagaxozaba.pdfIn PDF document text
    • https://mejebepagomuda.weebly.com/uploads/1/3/4/4/134494428/notit.pdfIn PDF document text
    • https://xavoxoxuda.weebly.com/uploads/1/3/1/3/131379246/9319323.pdfIn PDF document text
    • https://jobubati.weebly.com/uploads/1/3/1/4/131453688/nasow_wovimulatu_geregos.pdfIn PDF document text
    • https://xemifedawunata.weebly.com/uploads/1/3/0/7/130775780/6511370.pdfIn PDF document text
    • https://fogofude.weebly.com/uploads/1/3/4/3/134322730/6169421.pdfIn PDF document text
    • https://rupodekopo.weebly.com/uploads/1/3/4/6/134642208/pinaginajiz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453105/normal_5fa4f775e0071.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://s3.amazonaws.com/zetare/affidavit_of_bona_fide_marriage.pdfIn PDF document text
    • https://s3.amazonaws.com/mejigavukolu/apricot_seeds_poison.pdfIn PDF document text
    • https://s3.amazonaws.com/rekibedafowow/macon_ga_restaurants_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xopugup/feremowewepozivez.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_off0000c8be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8BE 5108 bytes
SHA-256: 3eb7e21f4cb3eb76471c2d929571f91c207384bca2e565993f81780212115eb9
font_01_sfnt_off0000da06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA06 10832 bytes
SHA-256: 188fc523b973d64b2be34b4f33923ebb2b62ef6e10f131d16a29156d84162486
font_02_sfnt_off0000fedf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDF 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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