Malicious PDF — malware analysis report

Static analysis result for SHA-256 159136a638fc791e…

MALICIOUS

PDF

79.2 KB Created: 2021-03-22 11:41:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: b1d8e9b717c0c546fbc055febf62bd61 SHA-1: c37c1e3668585ce72fed3b77d2ed41cc5dfb4ce5 SHA-256: 159136a638fc791ee11a1ef204f27bed99aafe3d86564e73d9953a94cac685f4
202 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and a mass of external links, many pointing to disposable hosting. The heuristic firings indicate it's a link farm designed to redirect users, likely for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent, consistent with a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 8

  • 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 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.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ponafet.ru/award?keyword=local+agenda+21+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4471467/normal_6041f6cb17950.pdfIn PDF document text
    • https://namebobave.weebly.com/uploads/1/3/0/7/130739452/zafanitixaneza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406787/normal_60159510260f9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456132/normal_5fe2ec637724a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383452/normal_604d602f16d15.pdfIn PDF document text
    • http://keep-travel.com/16292823284efer5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444626/normal_600c9254a7c0f.pdfIn PDF document text
    • http://catsism.com/red_heart_pooling_yarn_hautebnskl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374696/normal_5fcb8f54d564d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453888/normal_604bc42d0bafc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4530846/normal_5fee3bae5ad48.pdfIn PDF document text
    • http://copyright-help-report.com/71712714141qarrj.pdfIn PDF document text
    • http://tiktokcopyrighthelpteam.com/timex_ironman_triathlon_gps_watch1cyxz.pdfIn PDF document text
    • http://spainsale.pro/dibujos_de_la_creacion_para_colorear6u0ew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366961/normal_601e357854067.pdfIn PDF document text
    • https://bazunebusa.weebly.com/uploads/1/3/5/3/135397504/jaxafof.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501963/normal_60026e5f9e38c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/8abb6476-e1c3-475b-9cf8-1d44caa8db65/panasonic_dmc-sz7_user_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad4b3bdc-d756-4235-b8f8-d28632e22b2d/lyrics_i_dont_care_about_you_guns_n_roses.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3804aa8-457a-4d95-b945-421a1ee1fc25/into_the_wild_jon_krakauer_synopsis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53d565e8-ef11-4a52-941c-c9fd8870b000/renogarumoxivunawinugap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2dd9e8f7-5f73-4a8c-8271-f6f15b27d659/wudebitakurezotuzineti.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB6 4832 bytes
SHA-256: 97bc4293df6ef6c2d6df7959ef9e8f7e45854ab3549e967b79bc4e32ea356dd8
font_01_sfnt_off0000fc30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC30 10896 bytes
SHA-256: 91137580a5f904049baeb216b16c9b9678178853314c33f1b5a03c3de70d8918
font_02_sfnt_off0001214f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1214F 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f