Malicious PDF — malware analysis report

Static analysis result for SHA-256 609430b3235756fe…

MALICIOUS

PDF

77.0 KB Created: 2021-03-25 17:22:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 73e76393c803d1d3c386b238f8427f80 SHA-1: eb876f3ed6919c6328ade4b35c4133202a697dab SHA-256: 609430b3235756fe9b14bf4a19d9b235c803868cf0e4061d3a68957a9fd39751
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by multiple heuristics, including ClamAV and an ML classifier, and contains a large farm of external links. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic suggest an attempt to manipulate search results or redirect users to malicious content. While no scripts were explicitly extracted, the nature of the link farm and the overall detection indicate a phishing or malicious redirection attempt.

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 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://xajibur.ru/award?keyword=brochure+pdf+volvo+xc40 PDF link annotation
    • http://xulubapatoso.scienceontheweb.net/samsung_galaxy_s9_plus_size.pdfIn PDF document text
    • https://cdn.sqhk.co/nugunexinazo/A7njdgh/vamagulopoteloxer.pdfIn PDF document text
    • https://cdn.sqhk.co/jogekiluse/haYZihz/84720499773.pdfIn PDF document text
    • https://cdn.sqhk.co/jexozumumanu/hLMKYid/12494064685.pdfIn PDF document text
    • http://pawomodom.medianewsonline.com/bugarupedojadimofavago.pdfIn PDF document text
    • http://wedurorokim.mypressonline.com/how_do_they_install_fios_internet.pdfIn PDF document text
    • https://cdn.sqhk.co/lodoseduler/YgfNIgF/91960606967.pdfIn PDF document text
    • http://jasazotinalol.mygamesonline.org/american_standard_furnace_freedom_90_single_stage.pdfIn PDF document text
    • https://cdn.sqhk.co/porosobof/L4nyxii/sijujowixazoxomirikefiw.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/rizoli/nibam.pdfIn PDF document text
    • https://s3.amazonaws.com/papuja/what_battery_for_nixon_watch.pdfIn PDF document text
    • https://ed59cdd8-0d75-4634-8bb2-7afdb9da103e.filesusr.com/ugd/9cb112_7544c954a5e0469e9d6f8e53510e0964.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wazagidonux/aatish_full_movie_400mb.pdfIn PDF document text
    • http://wegugoleta.onlinewebshop.net/6311968285.pdfIn PDF document text
    • https://s3.amazonaws.com/lanubili/bose_quietcomfort_25_apple_sur_android.pdfIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/73022459544.pdfIn PDF document text
    • https://7ae774ad-b64d-4473-a0b1-aa0db1e39e83.filesusr.com/ugd/3e7897_f3fa67e8beeb400bbe353277af1a2e38.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dufekifaral/actiontec_mi424wr_password_reset.pdfIn PDF document text
    • https://s3.amazonaws.com/figugipopar/benonos.pdfIn PDF document text
    • https://0502d5d0-a0f5-47b8-bc1c-644c46e4e431.filesusr.com/ugd/6cabbb_161d6c18487b4627a295b5c3377f17b0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bulozor/xukexajufitevatu.pdfIn PDF document text
    • https://s3.amazonaws.com/nuvukivaxiren/bhakta_kannappa_songs_naa.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_off0000eed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED6 5260 bytes
SHA-256: 3dcaaafc5ca6cce977b845e2f9b802acfbdc9bfedc71c7b679eb041ff8a3361f
font_01_sfnt_off000100cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CB 11152 bytes
SHA-256: b56b595eac870f0ddf26ad260d56a8a6e31eb08cb892715723309814f42bb5f9

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