Malicious PDF — malware analysis report

Static analysis result for SHA-256 1da9ac56fe4b848f…

MALICIOUS

PDF

77.4 KB Created: 2021-03-19 00:10:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 1c92b98aba05b01f891055c42fa8d8bd SHA-1: 5b3be59ad6e76d9fd89c7b4314a8c9654ff10c5c SHA-256: 1da9ac56fe4b848f62f2d4f36dd2a94804ee98727fe9e52c0b8bc76c87602de2
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 0.9998

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://baarspo.ru/wix?keyword=sour+cream+topping+for+pumpkin+cheesecake PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4402032/normal_604467f46451a.pdfIn PDF document text
    • https://cdn.sqhk.co/vamapoludi/gcgfjh5/download_game_monster_world_fire_full_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/wakewafo/fZPaFT0/gun_camera_3d_weapon_simulator_pro.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459324/normal_5ffc2d2d6d021.pdfIn PDF document text
    • https://cdn.sqhk.co/rojozedofaf/Zjcgi2s/messenger_apk_android_6._0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lizolubemerawi.epizy.com/bilal_saeed_bewafa_song_pagalworld.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a89a702a-30a5-4e3e-819e-1f310aa3c709/james_patterson_celebrity_net_worth.pdfIn PDF document text
    • https://297de083-771a-4730-a3b8-a2afe8c7d209.filesusr.com/ugd/47424f_0fcf5ceb8e284d9ab7f706fc8825b82d.pdf?index=trueIn PDF document text
    • https://67dc9804-4028-4298-afd7-d431d2c16fe6.filesusr.com/ugd/559c84_2e799c9bd8ed4fe89df158491fdf7c92.pdf?index=trueIn PDF document text
    • http://xuwanozofugis.epizy.com/13789486079.pdfIn PDF document text
    • http://tumanababaxa.epizy.com/fepumubuxujofipepimefosu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8283f15b-dcbf-4f15-b82d-e8e6a3cf4b49/32574521899.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d42df53c-a4ee-49e6-8b0a-b4a66e0f01e8/bodujarowibiwijolik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf82ddcd-31de-485f-8d12-dae8df3f9d3d/29444130383.pdfIn PDF document text
    • https://58960a86-a3f4-42d8-866e-ee2cf32068b1.filesusr.com/ugd/1ad962_12b7d8ff187641098252d6f4488e144c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5462aa69-7b4c-45b8-bc41-a19295562b8c/line_plot_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd613f14-8612-4471-8e98-c5cd13510dbf/dojaxa.pdfIn PDF document text
    • http://dedagujes.epizy.com/496744995.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C3 5564 bytes
SHA-256: 052dd26b8312a2e0914dd08b168378a47296682bcea8b77382615a541b556199
font_01_sfnt_off0001038f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038F 10852 bytes
SHA-256: 667ae4f7c19d6ff53db749a3009956173db6c67b0b80d9736db0fc85fa0008d0

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