Malicious PDF — malware analysis report

Static analysis result for SHA-256 eef1621fa8a19207…

MALICIOUS

PDF

78.4 KB Created: 2021-06-12 15:51:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: fbe712a7889f103af614c13b1a011549 SHA-1: 3dd484fbb8490df17f4f2ac28d1aad1ff11591b6 SHA-256: eef1621fa8a1920765492d3d80fcb99397befcca7db688e1c25922ce69414013
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO abuse. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs and the nature of the link farm suggest an attempt to lure users to malicious content or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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/123?utm_term=google+earth+topo+map+layer PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4453906/normal_604dc1efd9682.pdfIn PDF document text
    • https://rijigajigife.weebly.com/uploads/1/3/1/8/131856487/dunomole-mapux-vizuxikaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368991/normal_60c09fe8b9cb0.pdfIn PDF document text
    • https://melejorun.weebly.com/uploads/1/3/0/7/130775242/6685599.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473415/normal_60c0bd95e45f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457570/normal_60362d5d7562e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383444/normal_605cb196b7f2f.pdfIn PDF document text
    • https://gikotibosad.weebly.com/uploads/1/3/4/3/134332820/3725305.pdfIn PDF document text
    • https://jogelobob.weebly.com/uploads/1/3/5/9/135961552/4529c2215.pdfIn PDF document text
    • https://kunipasufit.weebly.com/uploads/1/3/0/8/130874165/bosubagazuvanibed.pdfIn PDF document text
    • https://malibuvebejonab.weebly.com/uploads/1/3/4/5/134524684/lotuwina.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414331/normal_5fc5bb26d97c5.pdfIn PDF document text
    • https://ravemazezaj.weebly.com/uploads/1/3/4/8/134885195/gekapegewomodo.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/6a560bba-bcd7-4075-816c-5d94a207f474/how_to_use_accu-chek_multiclix_lancet_device.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27320762-d080-46a2-8886-ac891fbdc06d/mini_militia_mod_apk_2020_free_download_latest_version.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86e01de4-07a5-4478-8fae-5a777a585f00/focusrite_scarlett_6i6_driver_windows.pdfIn PDF document text
    • http://xojifot.pbworks.com/f/latagazuvebujojotobawibaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec972ba2-ed73-4fba-a298-924deb6363c3/bevaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee49e376-6963-44d6-9baa-73b5843362cd/pevobulavowubomabogisuk.pdfIn PDF document text
    • http://mepijewaj.pbworks.com/f/gafidejoboniwozine.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_off0000e89c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89C 4824 bytes
SHA-256: e5df9b0df3c0c0dcaf22aed7422ccb1374ec422d33a4a1397cc8f26fc6cafdd8
font_01_sfnt_off0000f912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF912 10940 bytes
SHA-256: 33a79cddf007f676077d5e9391c0df7d9eb95045b2d2a2ded160cf754cef26d0
font_02_sfnt_off00011e90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E90 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333