Malicious PDF — malware analysis report

Static analysis result for SHA-256 928f3b4aeb40279d…

MALICIOUS

PDF

81.6 KB Created: 2021-03-03 01:53:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d3a93925119ce44d13f2cb1207fbb460 SHA-1: 2bc5f36b054f0194ddbad5c11c69c85eb0b4a14d SHA-256: 928f3b4aeb40279debddf3d00e81f41f05629b1df9cf4ba3b478dd526a0527ef
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://resalured.ru/wix?keyword=schlage+keyless+door+lock+installation PDF link annotation
    • https://cdn.sqhk.co/xipepovivik/ejbQpOl/6597655387.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448346/normal_6026b1d3d3b26.pdfIn PDF document text
    • https://cdn.sqhk.co/winanuwumovu/6giApge/liroviwuteru.pdfIn PDF document text
    • https://xigujevaw.weebly.com/uploads/1/3/4/7/134701692/xevapusegis.pdfIn PDF document text
    • http://apkweb.net/sutugisotibevafegejopojt89pv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463830/normal_602823e829763.pdfIn PDF document text
    • https://kovorugoza.weebly.com/uploads/1/3/1/3/131383314/tazulerebuxepiwelar.pdfIn PDF document text
    • http://pozesex.iblogger.org/caravaneer_2_walkthrough_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/javeduner/gjiiOhi/bofusevibadosuzawomiloxux.pdfIn PDF document text
    • http://pribor-poverka.site/lg_g4_bootloop_fixlhic9.pdfIn PDF document text
    • http://okrasote.info/93680025403axbxv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455179/normal_5fca9a95a12e9.pdfIn PDF document text
    • https://cdn.sqhk.co/miviterul/eBAfgjw/freezero_naxeex_mod_apk_android_1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xesidif.epizy.com/9839528194.pdfIn PDF document text
    • https://s3.amazonaws.com/bufipevuril/afterglow_headset_wireless_manual.pdfIn PDF document text
    • http://jilevatawew.epizy.com/christian_devotional_songs_free_old_malayalam.pdfIn PDF document text
    • http://puwagof.rf.gd/chrome_windows_7_offline_installer.pdfIn PDF document text
    • https://s3.amazonaws.com/paxuvagal/how_to_properly_put_on_a_window_decal.pdfIn PDF document text
    • http://webekilijonelew.epizy.com/parse_error_messenger_apk.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB82 5472 bytes
SHA-256: aa25514962a7f25e63d649e3bb8282c07de96a61e4ae50959283ac97a7c41213
font_01_sfnt_off0000fe18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE18 10684 bytes
SHA-256: 33494a46094cdd46080881498d16c4c9827f27bb45ff5492a3a3fd9b043ebdf0
font_02_sfnt_off0001228a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1228A 16496 bytes
SHA-256: ce9a691c50de591e783f08e7c1236b91f0fa97a444e0961910406aeadb3eb837

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