Malicious PDF — malware analysis report

Static analysis result for SHA-256 a02aff55dde36879…

MALICIOUS

PDF

82.5 KB Created: 2021-04-02 04:10:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 90acacb3684f9924c83cde16cf0bb0de SHA-1: d01727ab2cd979a9f45afee6feff3910e67f1abc SHA-256: a02aff55dde36879fd22f44341a890925d1eca9a465f3c80f65063b81ab594f6
176 Risk Score

Malware Insights

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

The sample is a PDF document that contains a large number of external links, many of which point to Weebly and S3-hosted PDFs, indicative of a link farm or SEO poisoning attack. The heuristic 'SE_CALLBACK_LURE' suggests a phishing or tech-support scam context. While no scripts were explicitly extracted, the PDF structure and numerous external links strongly suggest an attempt to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://midufefew.ru/wix?keyword=nec+m260x+projector+manual
    • https://zudejafig.weebly.com/uploads/1/3/2/6/132681624/jirifoz.pdf
    • https://kulojimafad.weebly.com/uploads/1/3/4/5/134518235/3ca4f34427.pdf
    • https://xipidutaz.weebly.com/uploads/1/3/4/4/134401361/nuvepiv-xedepo-xixuvu-pezuxefud.pdf
    • https://kenafowipadile.weebly.com/uploads/1/3/1/4/131437871/4177305.pdf
    • http://barberking.best/what_should_an_emotional_first_aid_kit_comprise_ofr9b9y.pdf
    • https://sojomirolasa.weebly.com/uploads/1/3/4/3/134325131/wanapo.pdf
    • https://nisaxiguxizi.weebly.com/uploads/1/3/5/3/135306566/b3ee65426ae29.pdf
    • https://larulesa.weebly.com/uploads/1/3/4/7/134717423/xozunudod.pdf
    • http://carinsusa.info/infinity_gauntlet_thanos_vs_darkseiddup9b.pdf
    • https://dujuzesafe.weebly.com/uploads/1/3/4/3/134355225/0dc1982d83041.pdf
    • http://aires.fun/88158905998s6k6e.pdf
    • https://cdn-cms.f-static.net/uploads/4417519/normal_602aac898519d.pdf
    • http://reduslim-italiaufficiale.site/ielts_writing_task_1_pie_chartrfysn.pdf
    • https://cdn-cms.f-static.net/uploads/4388617/normal_601f8f937e563.pdf
    • https://xabomipa.weebly.com/uploads/1/3/4/4/134484571/1d25eb3f7c101.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://eaae50f7-3b1c-4f1b-9b3c-e2a48377569d.filesusr.com/ugd/b96e41_c019abaed1e540bdaedb0cc9be384079.pdf?index=true
    • https://s3.amazonaws.com/nuvukivaxiren/19342000852.pdf
    • https://s3.amazonaws.com/xumakomowi/friendship_status_videos_in_tamil.pdf
    • https://s3.amazonaws.com/rekawexuretowo/where_can_i_donate_winter_clothes_near_me.pdf
    • https://s3.amazonaws.com/pasutiz/13002037178.pdf
    • https://cc67bef4-e22e-42fd-bf01-3f02b15f800b.filesusr.com/ugd/080020_78506f0856894ebda6530353650f9056.pdf?index=true
    • https://041aa876-b65b-432c-96c0-58c8b295a4e4.filesusr.com/ugd/90d19e_542fc4329eea4023857cc780ed7a31f0.pdf?index=true
    • https://09af0a6c-c0e6-47ff-90c1-5b173435ccd1.filesusr.com/ugd/b92b66_32f255d0d1d948e38cee7068bd2fecf0.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4d7.bin
a9342c1a4abab7b9ae73a55694c79c818e44d14f18ffad2b0f7f00c5359b2999		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D7 5276 bytes
font_01_sfnt_off000106b6.bin
749086f280ffd86aaa7934abb0e85be6ebbb5c76a458b3948ec9aee5fa41906a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106B6 11680 bytes
font_02_sfnt_off00012e50.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E50 4324 bytes

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