Malicious PDF — malware analysis report

Static analysis result for SHA-256 525a76378061ed11…

MALICIOUS

PDF

74.7 KB Created: 2021-03-22 14:55:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb0fe7e99f1e6e63c61a6e25a23c2d4b SHA-1: fb449ce25f177e1803f46b5d55107b5a0c1b05e8 SHA-256: 525a76378061ed11302e9746c8888712452d508739e4c253b210e193d37734f9
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 are SEO-optimized and point to potentially malicious content, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV also flagged this PDF as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, contains references to 'dragon city hack tool apk for android', suggesting a lure to a malicious website.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://leonvi.ru/wix?keyword=dragon+city+hack+tool+apk+for+android
    • https://cdn.sqhk.co/kafekata/aDkichg/hot_wheels_infinite_loop.pdf
    • https://cdn.sqhk.co/zimajigon/jbggdgc/old_board_games_for_sale_online.pdf
    • https://cdn.sqhk.co/kojetozativ/5OgfhfW/real_football_games_app.pdf
    • https://cdn.sqhk.co/bedepekemat/x1Yghfg/download_zombie_evil_2_mod_apk.pdf
    • https://cdn-cms.f-static.net/uploads/4409796/normal_60242b033f45c.pdf
    • https://cdn-cms.f-static.net/uploads/4418381/normal_60542499ec92c.pdf
    • https://vaviwajefumizin.weebly.com/uploads/1/3/5/3/135348181/polukajig.pdf
    • https://koxewujinam.weebly.com/uploads/1/3/3/9/133986689/1188267.pdf
    • https://lolozodosut.weebly.com/uploads/1/3/1/6/131606575/0d735a7.pdf
    • https://vasuxuduka.weebly.com/uploads/1/3/4/3/134322555/sevifulu.pdf
    • https://static.s123-cdn-static.com/uploads/4420760/normal_5fdf3bf544a9d.pdf
    • https://cdn.sqhk.co/gevajoke/hchgeoV/idle_weed_tycoon_mod_apk.pdf
    • https://cdn-cms.f-static.net/uploads/4384822/normal_6028554c37890.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zalomi/tecumseh_10_hp_engine_carburetor.pdf
    • https://s3.amazonaws.com/juwofuxufijup/transformation_horizontal_gene_transfer.pdf
    • https://6a1e2a5f-c456-4288-b9d5-5378f87870fb.filesusr.com/ugd/076fac_726cdb362a6541e392606d1353502c11.pdf?index=true
    • http://xexewul.epizy.com/jusos.pdf
    • http://mobopufo.rf.gd/colpitts_oscillator.pdf
    • https://9f53eded-325d-4e02-8430-7c09bd872488.filesusr.com/ugd/e04405_c424d817cbac47c8a0f8331efd814311.pdf?index=true
    • https://f8d82b49-d438-4da2-b906-f876cb6fe635.filesusr.com/ugd/12dc78_fa85104626cc4088bf47e3a88b67fc83.pdf?index=true
    • https://s3.amazonaws.com/fewifuwu/nubofilafiruwumujipuv.pdf
    • https://s3.amazonaws.com/vetamedisoz/calc_series_cheat_sheet.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e171.bin
6ec82418c299dfd9efedf571c28cee0241be93b0b676b5fa0986297035dcf999		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE171 5404 bytes
font_01_sfnt_off0000f3e3.bin
afe22b698df77d2ae0d1d009250af16771f9114c283830765909465486641806		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E3 13436 bytes

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