Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d795f964b7f3966…

MALICIOUS

PDF

77.9 KB Created: 2021-03-13 21:50:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 6622a55f2e9ec4ada9453e38796a0bf2 SHA-1: 56d5938fa61991422077e8c1836f0d09ab1f0fc2 SHA-256: 8d795f964b7f3966883bde321be3af10901190fbe57d4e0f65459116560e1ae9
134 Risk Score

Malware Insights

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

The PDF contains multiple external URIs and is flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The presence of a 'download button' heuristic further suggests a lure to trick users into clicking malicious links. The document body, though heavily obfuscated, contains references to wkhtmltopdf and a date, indicating it was likely generated programmatically to appear as a document containing search results or a download link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/award?keyword=bhagavad+gita+meaning+in+tamil+pdf PDF link annotation
    • http://mazikopipovix.mywebcommunity.org/42597685059.pdfIn PDF document text
    • http://worameruvejaka.mywebcommunity.org/basic_french_prepositions_with_english_translation.pdfIn PDF document text
    • https://sisexalixigana.weebly.com/uploads/1/3/5/3/135323773/3908926.pdfIn PDF document text
    • https://terifurarogo.weebly.com/uploads/1/3/4/3/134317228/sugozaz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412570/normal_5fdcf1ea96d5c.pdfIn PDF document text
    • http://lenuvivureropi.scienceontheweb.net/cant_help_falling_in_love_piano_chords_elvis_presley.pdfIn PDF document text
    • https://gejiraje.weebly.com/uploads/1/3/2/7/132740564/6129414.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449177/normal_600641e76bc9a.pdfIn PDF document text
    • http://doxisolawasusig.66ghz.com/business_letter_template_word_with_logo.pdfIn PDF document text
    • https://dirifulezidume.weebly.com/uploads/1/3/2/7/132740871/tisowazimofesewun.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://pogetowem.onlinewebshop.net/xekamelod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb5fc6c0-931a-4162-a66b-1f74ae8063f1/how_to_unmute_lg_flip_phone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4646c97b-11a6-4d74-a483-8a5d59b3d5a0/how_much_does_army_reserve_pay_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edb8cea2-dac6-4703-b685-885f3d48db34/75989959625.pdfIn PDF document text
    • http://wufagezigedo.onlinewebshop.net/nobody_mean_more_to_me_than_you_summary.pdfIn PDF document text
    • http://zelejiv.epizy.com/58820651863.pdfIn PDF document text
    • https://19e6fc83-c281-4d06-93fd-e8b16a02b90a.filesusr.com/ugd/ce5d00_53bfb6118bf44f84bddb640a056747d1.pdf?index=trueIn PDF document text
    • https://71f68c9c-1037-483c-a0ca-f268b7ddd3c8.filesusr.com/ugd/87fdc7_9efbd61f5ef7479db8a47edd442e55aa.pdf?index=trueIn PDF document text
    • http://vamudeb.epizy.com/adrenergic_receptor.pdfIn PDF document text
    • http://zesubilav.epizy.com/angielski_gramatyka_czasy_wiczenia.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cdd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD8 5288 bytes
SHA-256: 79eaf417fb6d61c5edde0544ca07da9644f70ad776955fb6d6459d30df7f46a2
font_01_sfnt_off0000dfb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB9 6068 bytes
SHA-256: 7a02da73c5ff24218d04b188db7d31ceb9303d5dedd43b645f18a615a19d9b6a
font_02_sfnt_off0000ef6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6A 10356 bytes
SHA-256: ff8a7c7cfdc120ecac75b7917fa4446cc1f8e92200f1b44ffeaf26b4142658ad
font_03_sfnt_off000112da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112DA 16172 bytes
SHA-256: 6e699eab9a6fef16b3ea923df7b93ce1c5cbd97c7a594d359cd98c90be4a35f1

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