Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5b2b529346b237d…

MALICIOUS

PDF

77.5 KB Created: 2021-01-11 21:01:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: b83fd585e6d34e4f7147ebaec1923b34 SHA-1: 0a2c9611176cc3ed83c0c87ad8a81abbce0cccc7 SHA-256: d5b2b529346b237d88cc15095c43a9085430b72ffd683ec23d221bda22001858
226 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to drive traffic or host malicious content. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document prompts the user to install a browser extension or update, a common social engineering tactic. While no scripts were directly extracted, the PDF structure and heuristics strongly suggest it's designed to exploit user trust to facilitate further malicious activity, likely leading to malware download or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://trafficel.ru/123?utm_term=idm+full+version+with+crack+free+download+utorrent PDF link annotation
    • https://site-1166749.mozfiles.com/files/1166749/carrier_chiller_model_30xw_manual.pdfIn PDF document text
    • https://site-1178084.mozfiles.com/files/1178084/tugeludesutu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457861/normal_5fe0b6fd18065.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374372/normal_5f89819bf2791.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465705/normal_5ff7191652958.pdfIn PDF document text
    • https://site-1177759.mozfiles.com/files/1177759/fojigedi.pdfIn PDF document text
    • https://gedinabudi.weebly.com/uploads/1/3/0/8/130814056/xizofulu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500677/normal_5fd14b433134b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494436/normal_5fb411e4b72b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412757/normal_5fe83f5789e08.pdfIn PDF document text
    • https://site-1175287.mozfiles.com/files/1175287/air_traffic_controller_school_memphis_tn.pdfIn PDF document text
    • https://site-1182116.mozfiles.com/files/1182116/gurukukuzuve.pdfIn PDF document text
    • https://site-1180490.mozfiles.com/files/1180490/pejilit.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/jadere/wrong_side_raju_full_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/miwolezedubujoz/cryptocurrency_the_trading_bible.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_off0000f130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF130 5416 bytes
SHA-256: 3682c15419faf5c554d9fa1c6a86f7f7036f7d8caef42bef3d94e6cb220c56a3
font_01_sfnt_off0001038a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038A 10848 bytes
SHA-256: ecc623c949f0d27bdd1f4dae6f8487b586d62d817cdbe11345b12aeb984c68dc

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