Malicious PDF — malware analysis report

Static analysis result for SHA-256 39699b9b7954ffc8…

MALICIOUS

PDF

86.1 KB Created: 2021-03-19 03:53:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 95f0e89a612b28d8662faf168ad993bc SHA-1: 5e80c5c7a1a30c0a988b295b2ae0843e76f06b78 SHA-256: 39699b9b7954ffc8a912bed2d2551a9dee832bed4ee12914c82d6ad62d4ae5b4
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://kuzutuzo.ru/award?keyword=roman+catholic+bible+pdf+free+download PDF link annotation
    • https://cdn.sqhk.co/potebuso/97CnTjj/37442060710.pdfIn PDF document text
    • https://cdn.sqhk.co/wufevinek/JifF0ii/74537986121.pdfIn PDF document text
    • http://instahelpforbusiness.com/27792283770ha89m.pdfIn PDF document text
    • https://cdn.sqhk.co/setawigiz/egePbhg/surosejowobazibogivagupes.pdfIn PDF document text
    • https://cdn.sqhk.co/sewizefaxiki/fginOii/tripp_trapp_chair_black_friday.pdfIn PDF document text
    • https://cdn.sqhk.co/fowipovoji/e6haPha/82921470139.pdfIn PDF document text
    • http://smm-target.ru/instagram_app_for_pc_apkg8fyc.pdfIn PDF document text
    • https://cdn.sqhk.co/luzigagoguna/G0tYsjh/sunanususu.pdfIn PDF document text
    • https://cdn.sqhk.co/vawupemowa/jajhelF/xiserarolemuwapivixap.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/luxelula/john_deere_tractor_plowing_snow.pdfIn PDF document text
    • https://s3.amazonaws.com/nonipesikiri/funarulasejabu.pdfIn PDF document text
    • http://najenovatuxi.rf.gd/39825470513.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf3c3977-5d89-4865-b0a8-1b34ac3e4b78/do_security_cameras_need_wifi_to_work.pdfIn PDF document text
    • http://xifenarubomes.rf.gd/90248393489.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b258465f-0718-4fa1-a132-d32483321872/which_roomba_is_best.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90af646d-496c-4cf9-ac70-0319fa17abed/zaboximafoximomoxafi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cae9a66-e91a-4a7c-b2d2-4521839f3a1d/kavovopewimeg.pdfIn PDF document text
    • https://s3.amazonaws.com/nafoxuda/life_without_limits_muskegon.pdfIn PDF document text
    • http://nozuwodapa.epizy.com/2009_holden_barina_tk_manual_my09_review.pdfIn PDF document text
    • https://s3.amazonaws.com/bikikanafopavu/78249452639.pdfIn PDF document text
    • http://dejomogilum.rf.gd/how_to_setup_airprint_on_brother_mfc-j4510dw.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_off0000fbed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBED 5456 bytes
SHA-256: bdf13ad7915e83d47787fc00460e2ce47fbf19bbebdb493183afcf2191f583ff
font_01_sfnt_off00010e5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5D 11580 bytes
SHA-256: 9c3c8202c225b4d70b8877809c26619b8e39c4058b65eeac5107df109bf40084
font_02_sfnt_off0001361f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1361F 16036 bytes
SHA-256: 354dce64f07f3d7acdf6a04edf763950ffbfec4edcbb4bfe17b65a83544077bb

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