Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcb5dcc8d0bfd06e…

MALICIOUS

PDF

78.6 KB Created: 2021-04-05 18:38:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 84c03e06bf914fe85a4e9041f83d4f8a SHA-1: d1168590ccd9624c40236714b471e2fdfbe4dcf5 SHA-256: bcb5dcc8d0bfd06e013f07c95c3cbc0ef558d7dbb7ac4c34e6a58dc2f6a558c5
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with a high risk score. It contains an embedded URI pointing to a suspicious domain, likely intended to redirect the user to a malicious site. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs. The presence of external URIs indicates an attempt to lead the user to a potentially harmful resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://vilenefex.ru/wix?keyword=the+keeping+quilt+pdf
    • http://korecos.ru/586172577898hzk1.pdf
    • http://mscredit.info/30166289972uu77y.pdf
    • http://digitaltoolsfor.xyz/bijiganudowx1jy.pdf
    • http://probmake12.xyz/xasebugiqt8ni.pdf
    • http://ru-en.xyz/what_do_the_lights_on_my_fitbit_flex_mean5e73s.pdf
    • http://idealicaitalia-official.site/91252820612pni95.pdf
    • http://about-central.com/75313527200lulb7.pdf
    • https://kejarokelevu.weebly.com/uploads/1/3/5/2/135297316/ruwazuv-dunokawu.pdf
    • http://cookwellbakewell.com/83006516666q5e7s.pdf
    • http://copyright-central-media.com/sub_zero_fridge_ratingsfusus.pdf
    • https://legoxadev.weebly.com/uploads/1/3/2/3/132302888/71984.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://4900ecec-7ac1-411c-be2c-b077674085c8.filesusr.com/ugd/493135_f12830491e3046c3b4957e1de518bc4d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/79bb75bf-86d6-4fc6-bb2a-4813f0c33fef/78318501682.pdf
    • http://lalowaxe.epizy.com/kirkpatrick_model_of_training_evaluation_questionnaire.pdf
    • http://sepenoneregepe.rf.gd/vocabulary_words_with_meaning_in_urdu_free_download.pdf
    • http://revasaxoz.epizy.com/31407254875.pdf
    • https://uploads.strikinglycdn.com/files/f561d02d-5a70-47c3-b3e0-bb4c50aae016/true_metrix_air_meter_test_strips.pdf
    • https://uploads.strikinglycdn.com/files/8b916a21-cce6-4541-9911-91ba1e2b6e08/manual_de_carreo_para_nios_gratis.pdf
    • https://uploads.strikinglycdn.com/files/fa938045-9345-454c-b573-be2ff671c593/simulacro_nacional_de_evacuacion_2019_colombia.pdf
    • https://dc383e6d-b7a3-4e67-a88a-227fa542b6c3.filesusr.com/ugd/72b0e7_ca016025017c407996b9ae401644807a.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_off0000ea23.bin
9d7e2d14f4a6b95f4ad2a25a1d259d5e656f026a7d2d97fb2c0374d8754a6448		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA23 4732 bytes
font_01_sfnt_off0000fa21.bin
1090fdddc3dde719ea9da38348fa6e0623ae3827142e6ef5fbec018a7e15601e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA21 11020 bytes
font_02_sfnt_off00011f26.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F26 4324 bytes

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