Malicious PDF — malware analysis report

Static analysis result for SHA-256 a50e275eeb2ee8bb…

MALICIOUS

PDF

79.6 KB Created: 2021-03-24 20:02:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c08ddac8c39b0ce548438779c0c2b5e2 SHA-1: d2c3f17aad7df9eaf68035ce38503b10bb43a17f SHA-256: a50e275eeb2ee8bb729ac2ea051d6f77f30e4496a601760239dee6bfca01ceb4
164 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many of which are likely part of a link farm designed to deceive search engines and users. The presence of a download button lure and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicate a phishing or malware distribution attempt. The document body, though heavily corrupted, contains references to 'Telugu bible offline app' and 'wkhtmltopdf', suggesting a pretext for downloading a malicious file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/123?utm_term=telugu+bible+offline+app
    • http://rm-swis-mine.com/35806234928dpy3o.pdf
    • http://doporujela.iblogger.org/sapna_choudhary_ke_gane_dj_video.pdf
    • https://vizegibog.weebly.com/uploads/1/3/4/4/134458583/41db00b.pdf
    • http://uggi-ugg.com/mugemafipafutizijapujoygvso.pdf
    • http://huaweistoreukr.xyz/zawagerijalajurerepitatneup.pdf
    • https://telidububiz.weebly.com/uploads/1/3/1/4/131452987/sixowigudilis_tomijoruv_tukogujozaba_janekeberavog.pdf
    • http://nupesupo.mypressonline.com/indian_historical_movies_on_netflix.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/0147336a-1221-46ae-aa10-fa776a6158b7/mesa_boogie_mark_iv_head_case.pdf
    • https://502e425a-54a0-4661-a3e6-c6e116bdb13d.filesusr.com/ugd/10da26_533aad5d25e14989a47f03aa2b381e6f.pdf?index=true
    • https://bef89f6e-6323-4b84-ad9d-a44490bfcc4f.filesusr.com/ugd/96768c_3e15b391f3164725880f814dc5420817.pdf?index=true
    • http://wixudilasajigil.rf.gd/67346094686.pdf
    • https://d6236f05-450e-4b96-9875-1783d83c708b.filesusr.com/ugd/912de2_335275a9a63944949346b8d57fa1fadb.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d2fdd01a-277b-42c5-813c-da8b4babba1a/export_garageband_project_to_mp3.pdf
    • https://uploads.strikinglycdn.com/files/2555cb7e-843a-461f-9af5-3575fe7f319f/34027849677.pdf
    • https://uploads.strikinglycdn.com/files/f7e637bd-43fe-48c8-b689-ff6838c6613c/10833833201.pdf
    • http://teropisarazo.myartsonline.com/mamiya_rz67_repair_manual.pdf
    • http://womilebejip.rf.gd/a_escrava_isaura_bernardo_guimaraes.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_off0000ed92.bin
4ac2c7958ad336dc6176919a100231ae56e7dbf8e142cbf8b2261ad5d0a5ab39		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED92 4688 bytes
font_01_sfnt_off0000fd8a.bin
a58211c582f8098b4d7faff4789325acf5005e01cea986169f6e7e95c62574c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8A 11140 bytes
font_02_sfnt_off000123a7.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123A7 4324 bytes

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