Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc2129162db192e4…

MALICIOUS

PDF

97.0 KB Created: 2021-04-03 17:50:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a2e8cb4fff2844b2a89a3925e2e7c3c6 SHA-1: 7d072ed12bc8ceb4ac4dfe8a4a4821118052276c SHA-256: dc2129162db192e4cd413c1ea87e7f88c1cefd3da929d811c1068c457aee752c
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, indicating a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://crophysi.ru/award?keyword=algebra+1+linear+equations+test+pdf
    • https://zajilonuxiwez.weebly.com/uploads/1/3/4/8/134871265/7700882.pdf
    • http://sezejawi.mypressonline.com/27715639314.pdf
    • http://domotoj.sportsontheweb.net/core_exercises_for_beginners.pdf
    • https://tixusevonatafix.weebly.com/uploads/1/3/4/6/134611731/jivevopixu_venapupuji_kenovasewoma.pdf
    • http://rixorevu.getenjoyment.net/25236426894.pdf
    • http://mizebojusur.mypressonline.com/types_of_software_packages.pdf
    • http://dazinifuxevoji.22web.org/myabl_app_for_android.pdf
    • http://kerorukaduwewit.iblogger.org/92980733858.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/7ab036cf-4255-4286-8b52-59c18da3964d/sajepinovalewitaxu.pdf
    • https://uploads.strikinglycdn.com/files/fee4ef4b-526b-4c62-bd3c-4813f130aa0b/davinci_kalani_4-in-1_convertible_crib_instructions.pdf
    • https://uploads.strikinglycdn.com/files/1fa6282f-c072-496d-b080-888554ddc85c/stihl_fs55_strimmer_for_sale.pdf
    • https://uploads.strikinglycdn.com/files/9ad856f9-a492-4b0b-a3f5-8af17521284a/thirteen_reasons_why_season_3_dvd.pdf
    • https://uploads.strikinglycdn.com/files/b5f558be-59bc-48bb-b202-589ba669a0f1/honda_hs520_snowblower_carburetor.pdf
    • http://wukosinigi.epizy.com/dma_technical_report_geodesy_for_the_layman.pdf
    • http://xiteberukebeki.epizy.com/54620860332.pdf
    • https://uploads.strikinglycdn.com/files/06f0cd9f-682d-4821-9902-f0d6f7aebe04/2015_lexus_gs_350_f_sport_msrp.pdf
    • https://uploads.strikinglycdn.com/files/da5a8856-16f6-4e50-bc05-fa48040cd327/humminbird_helix_5_g2_di_gps_fish_finder.pdf
    • https://uploads.strikinglycdn.com/files/9b22cde9-f20b-4771-ab04-cb42caed4e75/10788206781.pdf
    • https://uploads.strikinglycdn.com/files/194ab54e-963c-477b-b7fe-310eb191c259/black_and_decker_20_volt_max_string_trimmer.pdf
    • http://xijixabomama.rf.gd/80791317430.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013120.bin
f9697c2e8564eb66ee3f4d27dbf56ac42df2de90e4442c131a126f904119b132		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13120 5400 bytes
font_01_sfnt_off00014381.bin
2d2019bdd1a81da4bfa6a2ffb241d918490128f48802298fd64cd465321ebcce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14381 10468 bytes
font_02_sfnt_off0001671d.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1671D 4324 bytes

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