Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7c4caefce9da4e4…

MALICIOUS

PDF

81.8 KB Created: 2021-03-18 15:07:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9c60dbac469ce55769b192d330cad34e SHA-1: d21f80db01346344cf8b1f350ebcc5c4c627260f SHA-256: a7c4caefce9da4e4ec091b51de94f86ebfd383e01fba779ab5d2678c32bb06ab
156 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including PDF_SEO_LINK_FARM and CLAMAV_DETECTION flagging it as a phishing trojan. The embedded URL and document body suggest a lure related to a game mod download, directing users to a suspicious domain. While no scripts were explicitly extracted, the PDF structure and linked URLs strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://golowaki.ru/wix?keyword=tales+of+link+mod+apk+3.7.2
    • http://nigma24invest.online/98162743143guefl.pdf
    • https://static.s123-cdn-static.com/uploads/4375344/normal_600632667b6ff.pdf
    • https://cdn-cms.f-static.net/uploads/4485926/normal_60149044bc44c.pdf
    • http://pejofewetoz.22web.org/beltless_formal_trousers.pdf
    • http://powerpoint4you.ru/pebozinavaxabu0paai.pdf
    • https://static.s123-cdn-static.com/uploads/4452381/normal_5ff1e8ecbd123.pdf
    • http://rugozuravonabib.22web.org/wupepetudajewogezodi.pdf
    • http://arendaavto.taxi/suwuzemijukubebusujouj8oe.pdf
    • https://cdn-cms.f-static.net/uploads/4469355/normal_603f84789de3d.pdf
    • https://static.s123-cdn-static.com/uploads/4409395/normal_5ff4299043bc0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e041c61d-8de7-41c7-875a-30d722837042/how_to_apply_for_pregnancy_benefits.pdf
    • https://a1bd7baf-2de3-4c81-8914-4b74a732ecf9.filesusr.com/ugd/c89f15_b869daad425145998ba8d650e2e11af6.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0329dad5-4b7a-4a4c-b399-f58bf0fcdd16/tokyo_ghoul_season_3_netflix_release_date_australia.pdf
    • https://9fbeb193-358d-48fe-b9d9-45f8b63f6b3c.filesusr.com/ugd/ab67b9_e336bc84c29c4720b0f19e7eb6480a72.pdf?index=true
    • https://2daccc73-8708-4113-a26a-4f38906335d9.filesusr.com/ugd/f65175_a32bda8cd8ee42c3a97a501c0bd7800a.pdf?index=true
    • http://dileginaduke.epizy.com/91791359024.pdf
    • http://xazewuxeni.rf.gd/17389412861.pdf
    • https://uploads.strikinglycdn.com/files/5b5ab251-679d-49f6-ac37-76c909ce37ee/xubigivamapilegez.pdf
    • https://96a9e3af-f0c3-4048-9e6c-0ad8da3c6018.filesusr.com/ugd/15d534_266f1c3b3ff24e638392b000f18fd794.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e6413b85-80ce-4b5a-9dfb-b4a7dba974d4/stanley_fatmax_box_beam_level_72.pdf
    • https://uploads.strikinglycdn.com/files/cca17e3a-e3ff-4d5b-af26-7e54c94d98b1/zixibu.pdf
    • https://uploads.strikinglycdn.com/files/9d3a55d2-5127-455a-94b1-ccd04d0322d8/c_d_dog_food_coupon.pdf
    • https://uploads.strikinglycdn.com/files/529670ad-3a51-413c-b86c-ab4ecdcd9e1c/can_i_study_for_the_gmat_in_one_month.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_off0000f345.bin
6b08f71daa8089ef0062fde1337630c1df2a5507823ae23f8aecf954d3403b94		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF345 3832 bytes
font_01_sfnt_off000100d0.bin
41bfb9921c5d2b49b752426b53a302487e770143cddc42009f005477c9b33a81		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100D0 5512 bytes
font_02_sfnt_off00011391.bin
0a2a2ddb87623c355a91d7eaa963ed63dcfb5aeaecd8e084dc2ec4b16d88e5c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11391 11092 bytes

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