Malicious PDF — malware analysis report

Static analysis result for SHA-256 9de8b0c4d0957a6f…

MALICIOUS

PDF

73.7 KB Created: 2021-05-25 13:24:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f4e1398b1684dba6dc27c277e835af0f SHA-1: 3eb5181a4ec05e44593aee229c196f6325f0d6e2 SHA-256: 9de8b0c4d0957a6f93bbd95b7b7c68b2a2228897966e3c1bde31d7217e111e7d
186 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 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/strik?utm_term=tabla+de+brocas+para+machuelo+npt PDF link annotation
    • https://losuwasujiro.weebly.com/uploads/1/3/1/6/131637226/51e559530.pdfIn PDF document text
    • https://sudiduku.weebly.com/uploads/1/3/1/4/131452825/5f1d96.pdfIn PDF document text
    • https://fuwurukuzubefek.weebly.com/uploads/1/3/0/9/130969433/e6f387f4350e.pdfIn PDF document text
    • https://zuwukozoxuwiged.weebly.com/uploads/1/3/4/7/134713444/2723e0e0.pdfIn PDF document text
    • https://ruzudewalaxuge.weebly.com/uploads/1/3/4/4/134497745/69d3454c9fbbb32.pdfIn PDF document text
    • https://gizajowi.weebly.com/uploads/1/3/4/3/134314542/gosorezo.pdfIn PDF document text
    • https://ronuviwa.weebly.com/uploads/1/3/4/5/134587060/e40728182abbf2.pdfIn PDF document text
    • https://xidoxuzi.weebly.com/uploads/1/3/4/7/134707988/efbaf6abe.pdfIn PDF document text
    • https://piwetidij.weebly.com/uploads/1/3/2/3/132303123/768145.pdfIn PDF document text
    • https://xevefozivoro.weebly.com/uploads/1/3/5/3/135339272/kitubemasuv-nebuvukejo-pijiximuvo-jifuvu.pdfIn PDF document text
    • https://xoduwotef.weebly.com/uploads/1/3/5/3/135328954/852c5101a6bdf29.pdfIn PDF document text
    • https://mogoxolokelitaf.weebly.com/uploads/1/3/4/6/134645696/kuvuwunegusasaf_niwadasaf_buxikozat.pdfIn PDF document text
    • https://damemerivojed.weebly.com/uploads/1/3/4/3/134378109/vemifotojufigituk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gonasidupij/endothermic_and_exothermic_processes_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9032f58f-b433-46c5-8447-9502d87a3704/gunelizojepotewununideti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fb95ce4-93c2-4dbc-8557-fa2d9c215d1e/how_old_was_claudia_in_interview_with_the_vampire.pdfIn PDF document text
    • https://s3.amazonaws.com/tosevud/alta_via_2_dolomiti.pdfIn PDF document text
    • https://s3.amazonaws.com/gurafoga/17518159874.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ad97d5d-1a0c-4565-8d5f-36b7aae1a032/29841910507.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_off0000e00a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE00A 5404 bytes
SHA-256: cdb44b414ad2d5c4a388db4d62ed980a6e73ae2250e177453baf986650040c79
font_01_sfnt_off0000f232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF232 11584 bytes
SHA-256: 546156cedb92df56f94b0884bebd11bc876949d7a55afdf6aa508db79aab26fc

Open this report in the interactive analyzer, or submit your own file for analysis.