Malicious PDF — malware analysis report

Static analysis result for SHA-256 49431b36676ba81c…

MALICIOUS

PDF

93.9 KB Created: 2021-02-23 03:23:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 938ea325a33d991e5050ecd9768a2db7 SHA-1: bc26582ea131a26f22c45977874167b71962e1a3 SHA-256: 49431b36676ba81ca255f2e7e238bd8b0da41a4508f5a05220e5df7fb9de6e87
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting services and are likely part of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, and the presence of UTM parameters suggests an attempt to track user clicks. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

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://jacksth.ru/aws?utm_term=what+type+of+animal+is+bagheera+in+the+jungle+book PDF link annotation
    • https://tiwenevudadag.weebly.com/uploads/1/3/4/7/134715745/6320900.pdfIn PDF document text
    • https://nulaxevaximuji.weebly.com/uploads/1/3/0/7/130776814/webuzuzakuzejoro.pdfIn PDF document text
    • https://gagivoxiw.weebly.com/uploads/1/3/5/9/135991060/jewolofekenawuperu.pdfIn PDF document text
    • https://cdn.sqhk.co/lipetebo/3jahhge/lateximet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476766/normal_60159f37ca369.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480383/normal_5fe5533141fe5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lulanikigog.epizy.com/silamupaxifovikinazujuv.pdfIn PDF document text
    • http://gazezubutajon.rf.gd/semubole.pdfIn PDF document text
    • http://zefojebenodimu.rf.gd/islamorada_fishing_report_april.pdfIn PDF document text
    • http://xonezerimagu.rf.gd/skf_bearing_unit_catalog.pdfIn PDF document text
    • http://fererugame.epizy.com/l2r_slayer_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/gapuruxumeg/96321034628.pdfIn PDF document text
    • http://pevixogojo.epizy.com/dish_network_deals_for_returning_customers.pdfIn PDF document text
    • http://nopetavu.rf.gd/46430213103.pdfIn PDF document text
    • http://tavarifa.epizy.com/58444132895.pdfIn PDF document text
    • https://s3.amazonaws.com/tokit/bmw_x1_28i_2015_owners_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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001308b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1308B 5708 bytes
SHA-256: 1d965dff5b7a80ac9ff5f4ea0acaf7d839de80d63da86d61559f458d737dc91e
font_01_sfnt_off000143ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143ED 11956 bytes
SHA-256: a55bd66756c20a69aedd6b38ee93b3e04219a96a4b3c0cfa5dc03a292c493511

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