Malicious PDF — malware analysis report

Static analysis result for SHA-256 8511a3c67c9ed31c…

MALICIOUS

PDF

94.2 KB Created: 2021-03-16 21:22:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e0eebbe1baea5314c5f0237c657a62ec SHA-1: b52ddc675a47edd39437de8aa2db8b283f8bccfb SHA-256: 8511a3c67c9ed31cdcb4b04189a17b502916c4781f320985e38be710c1918b8e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, contains references to "Clash of Clans hack without download", suggesting a lure for users seeking cheats or exploits. The presence of numerous external URLs, including a link farm on disposable hosting, indicates an attempt to redirect users to malicious content or download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://golowaki.ru/wix?keyword=clash+of+clans+hack+without+download PDF link annotation
    • http://verifybadgesbusiness.com/legends_of_runeterra_cards_wikiuayjr.pdfIn PDF document text
    • http://ctyr.ru/tosot_70_pint_dehumidifier_with_pump_manualzkjgs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416125/normal_604f82732d53f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383582/normal_5ff70a440932d.pdfIn PDF document text
    • http://tesocoin.online/221209024221emut.pdfIn PDF document text
    • http://voninizi.iblogger.org/betpawa_apk_tz.pdfIn PDF document text
    • http://zenajok.medianewsonline.com/short_berg_balance_scale.pdfIn PDF document text
    • http://experiment.website/pdf_ausfllen_und_unterschreiben7mr6f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426679/normal_5fca21653ec22.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vitafunajubala.rf.gd/mabaposinuk.pdfIn PDF document text
    • https://a7da3e60-63c8-46c1-a846-eab7df628ed2.filesusr.com/ugd/bba345_df66bc0b8c6449899890a7e0480c29e1.pdf?index=trueIn PDF document text
    • https://393102e6-89af-4738-8cad-89662dba8dc5.filesusr.com/ugd/33a16d_8d829416d949458d8e235b2886b39a0e.pdf?index=trueIn PDF document text
    • https://61df3396-90b5-4b69-a3ae-475c9da6ebc5.filesusr.com/ugd/516574_0712b8dbfcbe4a5395883577d0149ab2.pdf?index=trueIn PDF document text
    • http://xakagigoneliv.myartsonline.com/lds_2021_youth_theme.pdfIn PDF document text
    • http://dopuviboxew.rf.gd/what_does_yellow_blinking_light_mean_on_juul.pdfIn PDF document text
    • http://lojabupabavize.onlinewebshop.net/32401529200.pdfIn PDF document text
    • https://ae9cd3fc-a2ed-4114-aa96-dd53a7e96ab4.filesusr.com/ugd/22cbe6_65de87eab5054557bf10c2c11cbe756f.pdf?index=trueIn PDF document text
    • https://ddf64d59-5240-4154-9987-17dfc28e22c7.filesusr.com/ugd/cec570_4ba625d524fa4b68b5c7f2e9f861a0c2.pdf?index=trueIn PDF document text
    • https://9e1b5e4e-b4ab-405b-8fdf-b3b6d7b19c28.filesusr.com/ugd/94ea38_d2df88d1b753403e98bf12d475ffaaa0.pdf?index=trueIn 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF415 6768 bytes
SHA-256: 944f77ce8e97acd5403b9092208e4b5d033a3b9970303680efe4c0d14ec5420b
font_01_sfnt_off00010539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10539 5076 bytes
SHA-256: 0f6c640be9d4a6061dbcbc880d0f5a68ac91d8d45e636d160f7c870c79aae294
font_02_sfnt_off0001168f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1168F 14360 bytes
SHA-256: e929fc088b6cfc05ba5eb60262b8e0c69099da2fe89a34cede5948dbf25c15a7
font_03_sfnt_off00014126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14126 17004 bytes
SHA-256: f48d3f74d72868b8ab7366e9ba7a00c45c989ff6ebdac65902257ca8fcdf6923
font_04_sfnt_off0001597e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1597E 6164 bytes
SHA-256: eed393d90e39f94b13b4f1acdb3123be71a2574d00062d6a43a59cda7f380e84