Malicious PDF — malware analysis report

Static analysis result for SHA-256 20c536d34112b400…

MALICIOUS

PDF

81.8 KB Created: 2021-03-08 02:29:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 10a5e3b64f7bb7a8766a75348ac01ef7 SHA-1: aceee2dcd12d0179faafa7de73cba44bd3645cd4 SHA-256: 20c536d34112b400905c7c2ac3c2848ebdf647d76ac031f878d39c6e0fb3f966
66 Risk Score

Malware Insights

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

The PDF document contains embedded URLs and is flagged by ML classifiers as malicious. The document body, though heavily obfuscated, appears to be a lure related to a search query, directing users to a suspicious domain. The presence of external URIs and the ML classification strongly suggest malicious intent, likely to redirect users to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • 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://bologen.ru/strik?utm_term=what+is+the+book+mortal+engines+about PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4418991/normal_602333912660f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393362/normal_60014a0b55d1d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502188/normal_5ff650327b60a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421460/normal_5ff618c94481b.pdfIn PDF document text
    • http://paxezot.getenjoyment.net/toshiba_ct-90325_tv_bluetooth.pdfIn PDF document text
    • http://jivusibofonefud.mygamesonline.org/transformational_leadership_in_nursing_practice_challenges_and_strategies.pdfIn PDF document text
    • http://gebikomuxe.getenjoyment.net/60274994801.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488315/normal_600f04127c6f6.pdfIn PDF document text
    • http://lupaper.22web.org/java_64_bit_windows_10_minecraft.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0daf0737-ad9e-442c-8158-603df34234e6/what_does_a_black_dot_on_my_tooth_mean.pdfIn PDF document text
    • https://s3.amazonaws.com/tokudapele/play_boggle_online_free_no.pdfIn PDF document text
    • http://riwatarabopa.rf.gd/troy_bilt_bronco_42_inch_riding_mower_reviews.pdfIn PDF document text
    • https://s3.amazonaws.com/nonabafat/bed_sheet_size_in_cm.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e9e0a89-2f2c-415c-8fa1-8a1000ad634e/74468332653.pdfIn PDF document text
    • https://s3.amazonaws.com/sifawekujiki/34947680204.pdfIn PDF document text
    • http://sogivuwe.onlinewebshop.net/5666893230.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c984174b-6aa3-4caf-92bc-c8ec930f9beb/teratuxadejuji.pdfIn PDF document text
    • http://vuvinumebipoje.rf.gd/sawibam.pdfIn PDF document text
    • https://s3.amazonaws.com/zosevid/kufokaxoru.pdfIn PDF document text
    • http://bejopobu.epizy.com/xijilibebusesi.pdfIn PDF document text
    • http://nupuzawov.onlinewebshop.net/how_to_calibrate_infrared_forehead_thermometer_model_qy-ewq-01.pdfIn PDF document text
    • http://jelasojeb.rf.gd/59207592051.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_off0001023f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023F 5316 bytes
SHA-256: 826064d05c24a7ccaff583a3c4bbf5cea1054d3d9eff40f47e9782ce8a9434bc
font_01_sfnt_off00011432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11432 11284 bytes
SHA-256: 61145531019881268a54573aafa4cec78505357bfba6ac2249064414d85c9d13

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