Malicious PDF — malware analysis report

Static analysis result for SHA-256 448b67f5eac6f7fb…

MALICIOUS

PDF

70.1 KB Created: 2021-01-24 01:18:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: b9f2fa65eed27d834550bd327ce96a3c SHA-1: e729845bda8f891738e6fc72cba64af9534f9a7d SHA-256: 448b67f5eac6f7fb3001c12ee7192a07d0e8e6716487c1d53c15feb42ae74287
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one prominent URL (`https://traffset.ru/123?utm_term=kel+tec+compensator`) flagged as suspicious. The heuristic `PDF_SEO_DISPOSABLE_LINK_FARM` indicates a link farm on disposable hosting, suggesting a malicious intent to redirect users. The ML classifier and ClamAV detection strongly indicate malicious content within the PDF.

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 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://traffset.ru/123?utm_term=kel+tec+compensator PDF link annotation
    • https://site-1174218.mozfiles.com/files/1174218/avira_antivirus_rescue_disk_iso_file.pdfIn PDF document text
    • https://site-1166673.mozfiles.com/files/1166673/diy_pom_pom_pokemon_book.pdfIn PDF document text
    • https://site-1179301.mozfiles.com/files/1179301/barsaat_2005_video_songs_bestwap.pdfIn PDF document text
    • https://site-1172798.mozfiles.com/files/1172798/96316693017.pdfIn PDF document text
    • https://site-1178153.mozfiles.com/files/1178153/ember_spirit_guide_dotabuff.pdfIn PDF document text
    • https://site-1178227.mozfiles.com/files/1178227/nutobiwomav.pdfIn PDF document text
    • https://xebagamalod.weebly.com/uploads/1/3/1/3/131383607/kunegavatol.pdfIn PDF document text
    • https://ganubidorebe.weebly.com/uploads/1/3/2/7/132740923/6510827.pdfIn PDF document text
    • http://zegevuk.22web.org/aspire_e15_wifi_driver.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rimamosapike.epizy.com/chhattisgarhi_gana_video_ing_gaana.pdfIn PDF document text
    • http://popeganezawojeg.rf.gd/zinenusoxixulikefun.pdfIn PDF document text
    • http://kixasudasiwub.epizy.com/15604986116.pdfIn PDF document text
    • http://bidusopevix.epizy.com/wewotisiwewufa.pdfIn PDF document text
    • http://vusegax.rf.gd/18247207055.pdfIn PDF document text
    • https://s3.amazonaws.com/nawuvud/candy_crush_saga_hack_apk_old_version.pdfIn PDF document text
    • https://s3.amazonaws.com/pujinit/dream_on_aerosmith_song_free.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_off0000d335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD335 5048 bytes
SHA-256: 6175e8af061a244c9c0e88fadb832423968f806763c3d16ed55bbf08df0c63ef
font_01_sfnt_off0000e44b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44B 11992 bytes
SHA-256: 62b97f3f3f91fe416e8bd98bddce16554e072306cdae4cdf069ddde5a0cdb82d

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