Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd1809a4e695d9ce…

MALICIOUS

PDF

82.5 KB Created: 2021-02-26 07:41:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 52f18c098ce3d3bd5704dc86fd8cdfeb SHA-1: e31b13f1148f1727f0369638c1d3079ddcd62e1d SHA-256: dd1809a4e695d9ce1a46332dff463ed7a437300a4f053ec393e5dd4f8b401118
166 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it's a link farm and uses suspicious, invisible links to external domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded URLs point to domains associated with malicious activity.

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
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://leonvi.ru/123?utm_term=left+behind+book+series+list+in+order PDF link annotation
    • https://felonuwonab.weebly.com/uploads/1/3/0/8/130814100/6652689.pdfIn PDF document text
    • https://rilewinip.weebly.com/uploads/1/3/5/9/135964764/zumuzi_fiwozivis_zerovanavaje.pdfIn PDF document text
    • http://requiremcgood.com/xaxibufibavm7xlg.pdfIn PDF document text
    • http://vash-fasad.live/grey_s_anatomy_episode_guide_airb5ovd.pdfIn PDF document text
    • http://creditscorefix.info/what_do_you_do_if_you_suspect_human_traffickingshfsx.pdfIn PDF document text
    • http://managerprogram.live/59861153092tmej9.pdfIn PDF document text
    • http://ezfix.asia/carx_drift_highway_racing_simulatorlmzmo.pdfIn PDF document text
    • http://tixesikixux.mygamesonline.org/94626778090.pdfIn PDF document text
    • http://pifedalune.medianewsonline.com/dream_interpretation_snakes_everywhere.pdfIn PDF document text
    • http://sosed.market/confidential_report_format_tamil_nadugoa28.pdfIn PDF document text
    • https://lixaworone.weebly.com/uploads/1/3/1/8/131871871/5122868.pdfIn PDF document text
    • http://momentshop.space/debajevenarogesetk9357.pdfIn PDF document text
    • http://lumacy.site/devarejusovusifobuwet.pdfIn PDF document text
    • http://dafagaketa.sportsontheweb.net/luxozikosotekid.pdfIn PDF document text
    • http://1xbet-regi.site/nekerurefemorubatufixose9ez2n.pdfIn PDF document text
    • http://pogadai.xyz/whatsapp_business_app_download_for_laptoprt8cm.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/savifin/poweredge_r740_manual.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7A 4720 bytes
SHA-256: 94e891b7484fb85c3c9e4e82439a9ecc9d3a9c4afe26107149c8a32cfafa773a
font_01_sfnt_off00010b70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B70 10244 bytes
SHA-256: acfdb64a527d462361f330e358712337696f95d9d4db0ebe355c03a14322d230
font_02_sfnt_off00012e8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E8A 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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