Malicious PDF — malware analysis report

Static analysis result for SHA-256 85f2b399a70dd926…

MALICIOUS

PDF

77.8 KB Created: 2021-03-29 20:06:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 560f98f40316bdae72314e572c6289df SHA-1: b7c4e93591806e55075e792806570c955a9e4ad3 SHA-256: 85f2b399a70dd926bdcae563826a361080f2db08e737d7a699fbccee911eafdd
164 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing and link farm attack. It contains numerous external links, including one pointing to 'https://maypoin.ru/wix?keyword=gta+v+apk+download+android', suggesting an attempt to redirect users to potentially harmful content. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

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://maypoin.ru/wix?keyword=gta+v+apk+download+android
    • https://cdn.sqhk.co/kakolutezegu/cZhbPhd/bajar_musica_gratis_para_android.pdf
    • https://cdn.sqhk.co/dibirolinu/bFFjmR1/livongo_teladoc_investor_presentation.pdf
    • https://cdn.sqhk.co/bujasugawo/kICgcFj/jojixisamitujiwodave.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://afa032df-bfad-47da-a9c8-c79260182993.filesusr.com/ugd/6f9b04_993568bfe7424f6daa8c1c015dd1e4e3.pdf?index=true
    • https://ff0b3df2-dc61-4aeb-9024-93fa9b5bc175.filesusr.com/ugd/aa14a9_7774c8cd64f94aa680b3f12b4f058fcf.pdf?index=true
    • https://df1882fa-13c5-42f1-8438-577935b594b9.filesusr.com/ugd/91932b_d6e7b59f07634b94b7599bc57c8562b9.pdf?index=true
    • https://006b50d4-ad2a-4261-8279-34542eb0d7b0.filesusr.com/ugd/a640e9_2d3de9c6b8374802ab8e4b86fae3e8a3.pdf?index=true
    • https://uploads.strikinglycdn.com/files/927afbbb-0103-4cf7-99f0-5832e01b963b/40941671870.pdf
    • https://s3.amazonaws.com/lanorolowu/xodovutepili.pdf
    • https://adc67df4-9ac4-4169-8225-f8d60376216a.filesusr.com/ugd/a1c2c7_f444f4ca46eb45c480fbb21842df8d58.pdf?index=true
    • https://9a60fab3-6fb0-4be7-9305-b2e3cc44d963.filesusr.com/ugd/811c4f_17c1a63f46e54b73aa3bf5640e2e922a.pdf?index=true
    • https://s3.amazonaws.com/jivagajamav/uspstf_colorectal_cancer_guidelines.pdf
    • https://30c74dc1-c3f2-4e71-8253-1ec84f3b94e1.filesusr.com/ugd/b8c6fa_728e7ed773e2469792598ff0f834d337.pdf?index=true
    • https://bef89f6e-6323-4b84-ad9d-a44490bfcc4f.filesusr.com/ugd/96768c_95e48222683b4abf87432271d8a33c2c.pdf?index=true
    • https://5663e088-3595-439c-971a-5873693bee35.filesusr.com/ugd/e98895_99cb484500ed4497ab519e8b64007d44.pdf?index=true
    • https://uploads.strikinglycdn.com/files/895dd0aa-3f03-46ef-ac8c-284d29c51aad/lesco_50_lb_spreader_deflector.pdf
    • https://09972071-4174-499b-90b1-de3619f59f53.filesusr.com/ugd/d1c05f_f1079bc9c4624a8aa1c842cac1fb4512.pdf?index=true
    • 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_off0000e822.bin
5648c7939e5bd139602001e9ead2abbbe9110290fd51f926d05b7e66a1850e73		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE822 4692 bytes
font_01_sfnt_off0000f831.bin
1eaa3f11d6cf0fe5e923229e4f7594e9adc5d9f57ef14541dcb2316e9abc31be		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF831 10612 bytes
font_02_sfnt_off00011c1e.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C1E 4324 bytes

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