Malicious PDF — malware analysis report

Static analysis result for SHA-256 48e3c73b889b7033…

MALICIOUS

PDF

77.0 KB Created: 2021-03-20 04:30:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a5f73a47dc43edd3a023c91317183b25 SHA-1: 5715973aa226b9e4d3dab877f286af7739c929b8 SHA-256: 48e3c73b889b703350ae4dce789f3ce0d6ecaec3a859f6fcfc112dcd78aa84c1
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to link farms on disposable hosting, suggesting an attempt to obscure the true malicious destination. The document body, though heavily obfuscated, contains references to search terms and PDF generation tools, reinforcing the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/wix?keyword=ixl+algebra+2+answers+pdf PDF link annotation
    • http://bigtittybella.com/roku_3800x_review3x1ih.pdfIn PDF document text
    • https://cdn.sqhk.co/dagozuwemep/bsZuhhT/abba_greatest_hits_album_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/gonolesuzam/bij6eUE/gravity_falls_garry_s_mod.pdfIn PDF document text
    • http://lowusonuraku.mygamesonline.org/xofunejafiji.pdfIn PDF document text
    • https://cdn.sqhk.co/bipozipo/jdqDVKj/wojevuvizirivaz.pdfIn PDF document text
    • http://bibopasaxuvibu.mypressonline.com/cefr_framework.pdfIn PDF document text
    • http://bigwin-1xbet.fun/archery_game_for_mobile4lgdy.pdfIn PDF document text
    • http://jikusofare.mywebcommunity.org/tamorekugemikefaxukimekaw.pdfIn PDF document text
    • http://filaminipanugin.iblogger.org/housing_allowance_application_form.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mepumubim.rf.gd/10728457748.pdfIn PDF document text
    • http://lirinuguwe.rf.gd/nordictrack_c700_treadmill_owners_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/rimepusox/tagal.pdfIn PDF document text
    • https://6998e30b-c911-4113-ab34-4c15204891c7.filesusr.com/ugd/429b25_dc58733c635a4e33bacaae82b7099880.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xisakazelelinim/todixikubosevike.pdfIn PDF document text
    • http://letutemoxeluz.onlinewebshop.net/99461686555.pdfIn PDF document text
    • https://s3.amazonaws.com/sirilagewuga/how_to_setup_asus_rt-ac66u.pdfIn PDF document text
    • http://dalufiba.rf.gd/83828661896.pdfIn PDF document text
    • https://39472683-7d43-4bc3-882b-0947a83fd973.filesusr.com/ugd/544c7e_47cc5d310f8d4cfa899cc0ed2a98c372.pdf?index=trueIn PDF document text
    • https://c941d99d-b58b-4215-81ce-525e38db2b81.filesusr.com/ugd/2dc4cf_0bbee002bab64d449f6cc605a367263e.pdf?index=trueIn PDF document text
    • https://3ff4c494-4984-418a-b709-7a5c611cca0a.filesusr.com/ugd/adbee0_85b15439a3bf4455a0f642f3b945c57b.pdf?index=trueIn PDF document text
    • http://tofedig.epizy.com/how_to_clean_your_washing_machine_bosch.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_off0000eceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEB 5580 bytes
SHA-256: e51bfc717ccd8e4bf94b3dc93106fd269fd155071633f13617c101ffda2470da
font_01_sfnt_off00010007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10007 11416 bytes
SHA-256: 03dc0b7d057eb4f5ac359a861a4f5937f6d9a68c99a14b56e8e58f43f230068a

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