Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b8276602bba090a…

MALICIOUS

PDF

73.2 KB Created: 2021-03-14 14:29:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 0b8b5339c26536f4c8dbc881154ed4f2 SHA-1: 2982414ab1fd1fd7d008dfc57c123804dffdd321 SHA-256: 9b8276602bba090a176450d9a5666375c6e14e68d419a74383080b4a7552d6a5
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and forming a link farm, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, potentially leveraging JavaScript for exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://baarspo.ru/wix?keyword=organic+chemistry+wade+solutions+manual+8th+pdf PDF link annotation
    • https://ledimame.weebly.com/uploads/1/3/5/3/135306483/dbdd620771a2971.pdfIn PDF document text
    • https://cdn.sqhk.co/gopuxipo/GmLghhj/fnaf_foxy_x_mangle_images.pdfIn PDF document text
    • http://xitawefavam.medianewsonline.com/84127151403.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408323/normal_600245c7e8fa5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453721/normal_6037d5326cd89.pdfIn PDF document text
    • https://pudomawiwo.weebly.com/uploads/1/3/5/9/135958378/lazawolu.pdfIn PDF document text
    • https://xuxasogunoniku.weebly.com/uploads/1/3/1/8/131856570/buwemagonoku.pdfIn PDF document text
    • https://vebogeperudibot.weebly.com/uploads/1/3/1/4/131455328/2266632.pdfIn PDF document text
    • https://cdn.sqhk.co/bujomukoda/eYkyhiQ/57955608554.pdfIn PDF document text
    • https://cdn.sqhk.co/wekaradukuve/jeXLjib/nufilusimowuximez.pdfIn PDF document text
    • https://nezejigon.weebly.com/uploads/1/3/4/6/134611081/momefefid_vuduk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380869/normal_604516792e0fe.pdfIn PDF document text
    • https://cdn.sqhk.co/kuretunaba/jdjhhbX/58906534496.pdfIn PDF document text
    • http://kavelizopepi.mywebcommunity.org/cylinder_volume_and_surface_area_worksheet.pdfIn PDF document text
    • https://dimitosakusefix.weebly.com/uploads/1/3/4/6/134631941/5733673.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/d4b8b214-c979-4d37-9040-dd46e22cf7ae/13791737168.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f831cb4b-3554-4b10-b892-35d468b5552d/7950498527.pdfIn PDF document text
    • http://ziwivazud.onlinewebshop.net/tawukifumekik.pdfIn PDF document text
    • http://sopexalibip.onlinewebshop.net/fijotukagutugenapuro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3a1161a-c8ab-49e5-8162-0463e7ce4e4a/45549245049.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_off0000d1f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F1 5864 bytes
SHA-256: b556a9f3a7732e10b56eac7a85f100ce7c8ede93a87ec0913e07aae5671bdada
font_01_sfnt_off0000e5ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CA 10300 bytes
SHA-256: b61a359077398d957e5461abd271821a28224daf921ad6a3df254ccb73cef759
font_02_sfnt_off0001091f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1091F 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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