Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4cc4e2c510d44fa…

MALICIOUS

PDF

76.3 KB Created: 2021-03-16 05:52:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d3723cf5a0ccd9fe2ecf6c4a3c11ac9 SHA-1: 21e53f0807407fd277444471a10e4756543a1408 SHA-256: a4cc4e2c510d44fa1fda071627dca19b56efb3fca542bcad2e5fbc6bfa718823
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. The primary external URL, 'https://zajinet.ru/award?keyword=algorithm+maths+pdf', suggests a tactic to manipulate search engine results or direct users to potentially malicious content. ClamAV also detected this as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0', indicating a phishing or trojan payload. No scripts were extracted, but the presence of external links and the ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/award?keyword=algorithm+maths+pdf
    • http://xotizel.iblogger.org/a_onda_filme_alemo.pdf
    • https://sonikegusu.weebly.com/uploads/1/3/3/9/133997348/66c682bd18.pdf
    • https://puxetesotomu.weebly.com/uploads/1/3/0/7/130739839/202884.pdf
    • http://ukranews.icu/kilobipupisazavoi6d7s.pdf
    • http://baxijemapuzoxu.22web.org/non-verbal_reasoning_practice_test_2.pdf
    • https://roxowuvunesoneb.weebly.com/uploads/1/3/4/8/134889799/todusupadugepo-wadoda-xebaxekubabagob.pdf
    • https://rubuvewoxuvima.weebly.com/uploads/1/3/4/8/134873715/596223.pdf
    • https://gilinolejokakis.weebly.com/uploads/1/3/4/6/134632374/b303917a833b6.pdf
    • http://ibkreactiva2020.com/25352924250l07lt.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/407e759c-8b5f-4d6c-8ab2-a51cba937422/7.3_l_powerstroke_fuel_system_diagram.pdf
    • http://davivizuvazofa.rf.gd/84599486840.pdf
    • https://s3.amazonaws.com/pigolo/nancy_drew_season_1_episode_12_watch_online_free.pdf
    • https://uploads.strikinglycdn.com/files/2a4ef043-16a3-4f82-9046-9cee12e5c10c/setixepuzujon.pdf
    • https://uploads.strikinglycdn.com/files/ab78bc57-8fe7-4db6-8d5a-90c62e919043/will_a_wireless_dog_fence_work_on_a_hill.pdf
    • https://s3.amazonaws.com/baxunaf/67979300604.pdf
    • https://uploads.strikinglycdn.com/files/27df7d95-daf6-4990-aa14-6491fce97222/is_mr_heater_big_buddy_safe_for_indoor_use.pdf
    • https://uploads.strikinglycdn.com/files/09a1b935-5197-46ed-a08d-dce13757938e/zuzisawilesemafoxew.pdf
    • https://uploads.strikinglycdn.com/files/b080dbe2-f1f3-4f3c-a889-b46db589e4b8/what_does_take_4_tablets_by_mouth_daily_mean.pdf
    • https://s3.amazonaws.com/kefodek/short_term_assignment_letter_template.pdf
    • https://uploads.strikinglycdn.com/files/cf1dd895-af69-4f4a-beb8-d44fdecbd544/11396642241.pdf
    • https://uploads.strikinglycdn.com/files/8a0f8760-20da-4691-b187-1cbd4fe5d57e/heil_furnace_error_codes.pdf
    • https://uploads.strikinglycdn.com/files/34b08ea6-d73e-4e0d-a49a-ca26fb9a9b76/tp_link_m5360_default_wifi_password_after_reset.pdf
    • https://uploads.strikinglycdn.com/files/b75f6aa2-1a67-480d-82c2-29a1eccc61ee/tixijob.pdf
    • http://garaloxuvenuwin.epizy.com/zilasaf.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee70.bin
8f0e35cbda6101011ee1d02195d1891de23ab8e75cb281adc8dd1970790fbf95		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE70 5444 bytes
font_01_sfnt_off000100c6.bin
f9203bdc650f101aa71ca72d297b0b986979c14d991125c1475c0ac50a8e4419		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100C6 10556 bytes

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