Malicious PDF — malware analysis report

Static analysis result for SHA-256 7529a068e52a83ef…

MALICIOUS

PDF

87.7 KB Created: 2021-03-16 18:44:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d1e9a48c4b4350fd2b4ccb79a7bdacc1 SHA-1: 1100128ccf4112dac868150040f6a5f6a96cc76f SHA-256: 7529a068e52a83efe4b7efd80e7c545755a45c201f8040bdd5ed4a972ee98c77
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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/wix?keyword=orpheus+eurydice+hermes+poem PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4414695/normal_60404b5a75df7.pdfIn PDF document text
    • https://zeregosuw.weebly.com/uploads/1/3/6/0/136055393/pebanerepuxowot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470833/normal_600a2a5873843.pdfIn PDF document text
    • https://turakenedonatup.weebly.com/uploads/1/3/4/6/134610331/8859216.pdfIn PDF document text
    • http://perfectiona.online/44296356842sh3q6.pdfIn PDF document text
    • https://wazolupagod.weebly.com/uploads/1/3/0/7/130775763/2391547.pdfIn PDF document text
    • https://vulopinuvi.weebly.com/uploads/1/3/1/1/131164419/depuna.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378390/normal_602d679936fda.pdfIn PDF document text
    • https://janejamav.weebly.com/uploads/1/3/4/8/134887015/900d7b0a98.pdfIn PDF document text
    • http://copyrightsupportforlnstagram.com/mukivumamomez76dp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460477/normal_602ba575bdb96.pdfIn PDF document text
    • http://kexolifowuj.medianewsonline.com/how_to_wire_a_micro_usb.pdfIn PDF document text
    • http://bumufirila.mygamesonline.org/38422819351.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lawiferow.myartsonline.com/8100019790.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77e3e70b-235c-4066-b576-03ac5de62f67/best_website_for_gmat_preparation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93ed953a-acdb-48da-8766-129b7628d1c8/536371786.pdfIn PDF document text
    • http://fataragoreb.myartsonline.com/lotabe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78cfb26e-df30-4831-8afb-44331024c904/acorn_chair_lift_user_manual.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC90 5200 bytes
SHA-256: df30e9acd27b4f3fb4e28a0bb1953642dbb2137daf24a538d8c3448c0fe5a39e
font_01_sfnt_off00010e15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E15 1800 bytes
SHA-256: 6d2a3a16cc464ce72cf05976c7f96a31c93af2202e0dc760c37a694345e222ee
font_02_sfnt_off000116a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A5 10904 bytes
SHA-256: d76c5e62940557b587568324cbeaf9a7e4e6f651357d7a6fab99ca8e948a9ca8
font_03_sfnt_off00013b4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B4F 16204 bytes
SHA-256: 31aa257675234f953cb39254c73a0c002637764ec2691c470e0912636c3685cf

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