Malicious PDF — malware analysis report

Static analysis result for SHA-256 115b7c872f7bb301…

MALICIOUS

PDF

81.1 KB Created: 2021-03-17 23:08:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a10bf273f1a3d43c92a666fac29c535a SHA-1: d4e25adc917b031b14edf04c8dcd3d62b88f86f3 SHA-256: 115b7c872f7bb301bd8ac4206b1eef68ddc80120d494ef5f310d817770763238
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO-based link farms and phishing. The heuristic PDF_SEO_LINK_FARM indicates a mass of external links, with one pointing to a Weebly hosted PDF. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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://ponafet.ru/aws?utm_term=maytag+washer+2000+series+error+codes+f6+e1
    • https://lusebedadejaxid.weebly.com/uploads/1/3/1/4/131407110/bbfb1f986286.pdf
    • https://cdn-cms.f-static.net/uploads/4384836/normal_6023f278606b4.pdf
    • http://toramomegigex.22web.org/bluestacks_software_filehippo.pdf
    • https://dowibowaxetejoz.weebly.com/uploads/1/3/0/7/130740522/411d4d8.pdf
    • https://cdn-cms.f-static.net/uploads/4404528/normal_5fd3104bbbcbd.pdf
    • https://cdn.sqhk.co/kifuzopeko/bhhMhh0/suzozemopozeruxu.pdf
    • https://vumirexow.weebly.com/uploads/1/3/2/7/132740730/4965942.pdf
    • https://cdn.sqhk.co/kagelemovo/dji9oha/black_friday_buy_online.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/88fab08b-6f70-4367-a7f4-287536739162/27128214096.pdf
    • https://uploads.strikinglycdn.com/files/f9e53182-2c21-4c7b-9e17-58782f8650a5/ninjago_season_11_episode_16.pdf
    • https://s3.amazonaws.com/rokuwapesu/white_apple_logo_free.pdf
    • https://s3.amazonaws.com/vebisop/nuravosisomuvozasijateva.pdf
    • https://uploads.strikinglycdn.com/files/91a8c3b5-b13b-4635-a4ee-63a9d2556da2/resea_el_arte_de_la_seduccion.pdf
    • https://s3.amazonaws.com/boduxatavepe/screen_grab_video_android.pdf
    • http://nokonasaxe.epizy.com/href_css_stylesheet.pdf
    • https://uploads.strikinglycdn.com/files/521dad56-6f7d-41e5-b344-b08df888de88/52751894967.pdf
    • http://lobosebaj.rf.gd/azure_application_gateway_certificate_arm_template.pdf
    • http://kosoluzenoderu.epizy.com/67053341086.pdf
    • https://uploads.strikinglycdn.com/files/9186a752-45fa-440a-bec8-8cff6bfb4fd2/92109371293.pdf
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa36.bin
ba5655c0552ea04a93aa4d4d651ef133c64c019e88ed95fcbf29f9945891f989		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA36 5932 bytes
font_01_sfnt_off00010e8f.bin
85b8b380982d2c033feac5e865f0415ce2e42857935e1838589032fc6b53762c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8F 11432 bytes

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