Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3bd39630f520e10…

MALICIOUS

PDF

88.9 KB Created: 2021-04-01 16:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 13ffa8c2fa05bba97514f2a795f50554 SHA-1: 1a49f12555bc16b623435783bc46b6cbfd094160 SHA-256: d3bd39630f520e10a5a906237adf2db18eab9252dc2545fe2a5a97d5badf0780
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of this document being used to distribute malicious content or phish users. While no scripts were explicitly extracted, the presence of external URIs and the overall detection suggest it's designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://kuzutuzo.ru/123?utm_term=macbeth+guided+reading+act+i+scene+i PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4451352/normal_602254371a7d5.pdfIn PDF document text
    • https://dexejajakoto.weebly.com/uploads/1/3/0/7/130739268/3462914.pdfIn PDF document text
    • http://metoxegid.mygamesonline.org/jenn_air_range_top_with_grill.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456999/normal_60442ef79aad4.pdfIn PDF document text
    • https://pulezigo.weebly.com/uploads/1/3/4/6/134600697/jobumavari_wewipenixobedud.pdfIn PDF document text
    • https://lofuniwap.weebly.com/uploads/1/3/0/8/130874201/xoxagedid_gedudagipaxazi_sakuz_dipotegixiwov.pdfIn PDF document text
    • https://gorejirulikem.weebly.com/uploads/1/3/4/7/134738880/dufirefado-wopan-tedome.pdfIn PDF document text
    • http://zodatowafe.getenjoyment.net/tewelowesip.pdfIn PDF document text
    • https://fogojokiverowur.weebly.com/uploads/1/3/0/9/130969702/bafajave.pdfIn PDF document text
    • http://mekujoviwe.mypressonline.com/82825982741.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sazasewugekupej.onlinewebshop.net/mtd_lawn_mower_carburetor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db45b49c-78a3-4cb5-9760-8306783dd5de/what_vintage_marbles_are_valuable.pdfIn PDF document text
    • https://s3.amazonaws.com/safago/icc_team_ranking_in_all_format.pdfIn PDF document text
    • https://s3.amazonaws.com/ratixifo/20259694684.pdfIn PDF document text
    • http://wudazebej.atwebpages.com/problem_solving_model.pdfIn PDF document text
    • http://pumejusatojajeg.rf.gd/fortnite_avengers_endgame_apk.pdfIn PDF document text
    • http://puwogufipuja.epizy.com/waman.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ae5b5b9-3400-46f4-bc9a-7cc79554cf85/40304885015.pdfIn PDF document text
    • http://jopinewo.epizy.com/factorisation_worksheets_grade_9.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e0c14c9-35dc-4f24-a011-95a5dc22bf91/does_nah_have_hydrogen_bonding.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8e3468f-27f1-4f13-8607-2dacd69e937f/14354391998.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/369648d9-98ea-4b96-bce2-f995ede1226d/vb.net_tutorial_free_download_in_hindi.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_off00011d5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D5D 5316 bytes
SHA-256: 64cd00a12b69911a7a47b3568e148022eff394ec2fb98e860807011fcf97dd47
font_01_sfnt_off00012f6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F6B 11452 bytes
SHA-256: 224ab55ba6e5ddb046bc47565f13f6a598c06209042bdc7bd57bee9e7e162ec5

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