Malicious PDF — malware analysis report

Static analysis result for SHA-256 74d2937b7e2323af…

MALICIOUS

PDF

80.1 KB Created: 2021-05-26 11:28:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 180b2fb251c818759238271aedb81506 SHA-1: 152d93d4061020a3a803a7938fc31b2c5f98cde5 SHA-256: 74d2937b7e2323af7f716a57ad64a3a6adb5f7d334a29d92c2cc5e8fd37f4b2e
156 Risk Score

Malware Insights

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

This PDF document is classified as malicious and exhibits characteristics of a phishing or SEO link farm attack. It contains a large number of external links, with one prominent link pointing to 'https://botokaw.ru/strik?utm_term=semi+log+graph+paper+pdf', likely intended to redirect users to a malicious site. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, suggesting an attempt to manipulate search engine results or distribute malware. No scripts were extracted, but the presence of numerous external links and the ML classification strongly suggest a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://botokaw.ru/strik?utm_term=semi+log+graph+paper+pdf
    • https://vuzavadakugodo.weebly.com/uploads/1/3/4/8/134857872/zidij.pdf
    • https://veguxalefimas.weebly.com/uploads/1/3/1/3/131382166/bimusunew.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lemerisinivum/33948285443.pdf
    • https://s3.amazonaws.com/legenapi/vurabejenomesev.pdf
    • https://uploads.strikinglycdn.com/files/2491953d-fca0-4430-acef-36ec87b8bbdf/why_is_my_moto_g_battery_draining_so_fast.pdf
    • https://uploads.strikinglycdn.com/files/006d5706-8e17-4e1d-980e-3b3750f64f48/1353107958.pdf
    • https://s3.amazonaws.com/betefowubevat/bootleg_movie_sites.pdf
    • https://uploads.strikinglycdn.com/files/56bb14f0-e073-435e-843f-6666af5d03c0/89684996540.pdf
    • https://s3.amazonaws.com/fogibi/tremble_bethel_chords.pdf
    • https://s3.amazonaws.com/tiduro/how_does_god_measure_a_man.pdf
    • https://s3.amazonaws.com/gorajikunobixi/les_miserables_violin_sheet_music.pdf
    • https://uploads.strikinglycdn.com/files/54a58fe5-2840-4c23-a41d-0da89daf0d5f/26128961247.pdf
    • https://s3.amazonaws.com/fizup/i_wish_you_more_read_aloud_online.pdf
    • https://uploads.strikinglycdn.com/files/969d4e60-8911-4c08-9fc7-817f309beb38/more_purple_more_better_reddit.pdf
    • https://uploads.strikinglycdn.com/files/bfea2bf3-57ac-4dc5-9671-b7542ba724f4/ratolijigijanagonuxode.pdf
    • https://s3.amazonaws.com/risisipajole/busujegorub.pdf
    • https://s3.amazonaws.com/jigezilor/spotify_premium_apk_2019_para_ios.pdf
    • https://s3.amazonaws.com/kuxegu/54705877910.pdf
    • https://s3.amazonaws.com/vukujidor/what_event_marked_the_end_of_the_radical_phase_of_the_french_revolution.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_off0000f85c.bin
85cfb0a3e4718a1e55eedda3a139f6daa3c91f2aa5494d145926e4b3f00451d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF85C 5380 bytes
font_01_sfnt_off00010a7a.bin
6586610773883f4243ffb5f58319557dc99c3ecebefb96c0c9745127a3a86d9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7A 12040 bytes

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