Malicious PDF — malware analysis report

Static analysis result for SHA-256 342442cb0423a3c9…

MALICIOUS

PDF

81.5 KB Created: 2021-03-17 20:15:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6f8e41efc2a4cde9f4dec71e3ed4cb60 SHA-1: 509c82d0d7f07e2768bc8c30bddef5378b4d95c5 SHA-256: 342442cb0423a3c9f7bb37cfdbdbd8201ec91c9ae8251ae70c338d77a47928f8
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-themed, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as Pdf.Phishing.Trojan. The embedded URLs, particularly the one on 'golowaki.ru', are likely part of this malicious infrastructure. No scripts were extracted, but the PDF structure itself is indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://golowaki.ru/wix?keyword=holes+questions+and+answers+pdf
    • https://cdn.sqhk.co/xoripudesew/iCbDjaJ/bluetooth_driver_android.pdf
    • http://gavolav.mywebcommunity.org/hctz_davis.pdf
    • https://vidiguwases.weebly.com/uploads/1/3/4/3/134347373/82efdd07d4d.pdf
    • https://cdn.sqhk.co/lalivaga/jfdhehj/gunblood_2_player_games.pdf
    • https://cdn.sqhk.co/viwedanej/YlmIgdG/kojebobodexonoveb.pdf
    • https://tikivumisa.weebly.com/uploads/1/3/5/3/135346314/7c3b302b829c9d4.pdf
    • http://mapenibo.scienceontheweb.net/antrenmanla_matematik_2.pdf
    • https://dozojabipow.weebly.com/uploads/1/3/4/0/134012686/jatilituvig.pdf
    • https://biwopotalar.weebly.com/uploads/1/3/1/4/131438783/7282899.pdf
    • https://motuzepiruwilo.weebly.com/uploads/1/3/4/3/134348631/1228435.pdf
    • https://cdn.sqhk.co/jufebarur/4Im3tii/sekax.pdf
    • https://wixinuwexe.weebly.com/uploads/1/3/0/7/130739185/420aedf48.pdf
    • http://bitiwiz.medianewsonline.com/ponezulaxakajutitege.pdf
    • https://cdn.sqhk.co/dabozijide/ahjhiha/89472776586.pdf
    • https://dexekuweda.weebly.com/uploads/1/3/4/7/134705305/fubepikikopogitim.pdf
    • https://zigudawaza.weebly.com/uploads/1/3/6/0/136035030/miwonawokuwatezefeg.pdf
    • https://cdn.sqhk.co/bokupajokim/ijKgfje/9731577824.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/gapuruxumeg/imp_oral_defense_questions.pdf
    • https://s3.amazonaws.com/sizadagazagaj/20462681547.pdf
    • https://s3.amazonaws.com/warapagefasovi/census_report_of_odisha_2011.pdf
    • http://benamow.myartsonline.com/bakalixiraxes.pdf
    • https://s3.amazonaws.com/rowubunak/66173266271.pdf
    • https://s3.amazonaws.com/jizubisetebof/always_korean_movie_eng_sub.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_off0000f3bd.bin
6bcbce1c65145fa86154c6e5c185818bdf620ab3652a03b3dd00ddba28de51e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BD 5096 bytes
font_01_sfnt_off00010528.bin
6424b96e3467d5e73c9ca420d491d4a6725b3df5a25bc319a3fd0a215f8a804f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10528 11264 bytes
font_02_sfnt_off00012aa6.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA6 4324 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.