Malicious PDF — malware analysis report

Static analysis result for SHA-256 946cb39ba7496e74…

MALICIOUS

PDF

92.6 KB Created: 2021-03-23 03:41:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: ca91ab89011cc7f95ecc833caf4645c8 SHA-1: e3aa932b484b2019736cd9d009b8ab3234febb84 SHA-256: 946cb39ba7496e74687fb0f28249ae29e298af7f9eb6c2f959f632a2fe94f7a0
222 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'dafemum.ru'. Additionally, it exhibits characteristics of a link farm, with numerous external PDF links, suggesting an attempt to distribute or redirect users to malicious content. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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
  • 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://dafemum.ru/strik?utm_term=wooldridge+econometrics+solutions+5th+edition In PDF document text
    • https://wugowimuvup.weebly.com/uploads/1/3/4/7/134762233/zefuxazunixe-keludivuwile-jatazutad.pdfIn PDF document text
    • http://rimiminigi.22web.org/97267190299.pdfIn PDF document text
    • https://gufogirim.weebly.com/uploads/1/3/5/9/135967500/9153532.pdfIn PDF document text
    • https://gizukazirup.weebly.com/uploads/1/3/4/4/134443136/8894681.pdfIn PDF document text
    • https://paguvobidelovug.weebly.com/uploads/1/3/2/8/132815355/2d87b5619.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/38b62de2-bd92-43b3-8426-b4da61a0d54d/watch_dungeons_and_dragons_movie_online_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e974b07f-efb5-45be-8c91-a49572e4d79f/36056897389.pdfIn PDF document text
    • https://s3.amazonaws.com/selivuvumepaveb/94473711648.pdfIn PDF document text
    • https://bf130ee1-1463-4c69-9604-1b23772ced92.filesusr.com/ugd/b4609a_8451bd2ce2354ea98db6b168cb1cacda.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/alphabet_hd_video_song.pdfIn PDF document text
    • https://s3.amazonaws.com/perurulexi/how_do_i_check_if_the_alternator_is_bad.pdfIn PDF document text
    • https://s3.amazonaws.com/wupagivoz/armitron_watch_wr330_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc217384-f286-421d-b558-2bf31fd0ccbf/lean_canvas_template_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf2b4b88-6c04-4d7b-9fd7-ba1a65afaed0/jomitagowejeku.pdfIn PDF document text
    • https://s3.amazonaws.com/rojalexipokadaz/50862782041.pdfIn PDF document text
    • https://e5058785-d3d1-442e-b0ad-d0045053dde7.filesusr.com/ugd/17c622_7b101a579fc84396869bb2d7dd52c41f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sejakopa/10716764400.pdfIn PDF document text
    • https://b8f7bc2e-5f90-466c-a76c-b8215bfdb3ae.filesusr.com/ugd/9717d9_a5834901251e428985e8b8f0e00f42f4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jokotaziweluge/first_aid_step_1_2019_changes.pdfIn PDF document text
    • http://dexidije.epizy.com/blanche_neige_grimm_texte_intgral.pdfIn PDF document text
    • https://s3.amazonaws.com/sizabo/b._e._r_forever_mine.pdfIn PDF document text
    • https://s3.amazonaws.com/kulinisokakewi/bahia_de_los_angeles_fishing_report.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BA 5576 bytes
SHA-256: e770d3c7d953943d0d826b626f889ba15af09f81e07821804f6bbd7186af9465
font_01_sfnt_off00011b63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B63 4080 bytes
SHA-256: 9b55fab1688a61f9f73b8ab264fbe4af0e0902e7c2bcee19149ba249ade1febb
font_02_sfnt_off00012972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12972 5280 bytes
SHA-256: d4995d9f22b5b09d82791002d22b9ce7055bc5b5435c5cbf9d7e500606859b32
font_03_sfnt_off00013b4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B4E 11852 bytes
SHA-256: 202af748f3ceaf5d01a636190ed019f17c642b76fd95362244fba4b49fb9d88f

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