Malicious PDF — malware analysis report

Static analysis result for SHA-256 687e008f6792f48f…

MALICIOUS

PDF

76.3 KB Created: 2021-01-21 04:25:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 88be90b6c5778c584ddb77572aafa8f9 SHA-1: 7d5ca7068b4815d80a691650059b7a515320f689 SHA-256: 687e008f6792f48f15168dc0337c9ec1460c2baa58a48c8c54a25536b6a99351
134 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of numerous external URIs, many hosted on disposable domains and forming a link farm, strongly suggests a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains references to 'liker apk tiktok', indicating a lure for potentially unwanted or malicious applications.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/123?utm_term=liker+apk+tiktok PDF link annotation
    • https://site-1237907.mozfiles.com/files/1237907/26292814527.pdfIn PDF document text
    • https://cdn.sqhk.co/pumurugo/XD1jbgc/dodagevoliwobaj.pdfIn PDF document text
    • https://cdn.sqhk.co/nufomewo/ijfIPpA/48453614852.pdfIn PDF document text
    • https://site-1250167.mozfiles.com/files/1250167/4492284509.pdfIn PDF document text
    • https://cdn.sqhk.co/jegamaxegev/j1iauij/survival_battleground_game_download_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/wepurodapike/hjMEDih/29372954361.pdfIn PDF document text
    • https://cdn.sqhk.co/vowibesep/6hiAA6L/lupotusemopure.pdfIn PDF document text
    • https://cdn.sqhk.co/kowaziwaso/iihenB2/11634722079.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/zonivezada/el_par_biomagnetico_isaac_goiz_duran.pdfIn PDF document text
    • http://nipufafinera.epizy.com/89470652623.pdfIn PDF document text
    • http://fezivepe.rf.gd/simple_and_compound_sentences_worksheets_5th_grade.pdfIn PDF document text
    • http://nanesipub.rf.gd/rpg_maker_vx_2003_free.pdfIn PDF document text
    • http://mugevewobota.rf.gd/55613038160.pdfIn PDF document text
    • http://kavunuses.epizy.com/tezovigupakevuwoguz.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CC 4288 bytes
SHA-256: 85e8925d5a3043e61ea40e9b45f83c6d64bafe3ab18a2132549ed2726bf92b9b
font_01_sfnt_off0000f262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF262 10696 bytes
SHA-256: 1ea2b71755280b39538de45c28e61f5205f0835f5c7e1fa8164b895fb3ff5e4d
font_02_sfnt_off000116e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E6 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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