Malicious PDF — malware analysis report

Static analysis result for SHA-256 beb5dbc2565abd21…

MALICIOUS

PDF

76.4 KB Created: 2021-02-23 23:46:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 7a2cb5d35a6c986f3d499b85c99d571f SHA-1: ec8bebb5d80c7afee9431acffd0aede275a6879e SHA-256: beb5dbc2565abd21082a5c057c94d53770edf40a7a2899bfa454943dbc5b3cb5
136 Risk Score

Malware Insights

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

The PDF contains a link to an algorithmically-generated URL, which is a strong indicator of malicious intent. The document body, though heavily obfuscated, appears to be a lure related to fitness information, aiming to trick users into clicking the malicious link. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://seumenha.ru/strik?utm_term=what+are+the+best+exercise+for+strengthening+your+biceps PDF link annotation
    • https://nikevafojo.weebly.com/uploads/1/3/4/6/134680040/kugopu_xoruv.pdfIn PDF document text
    • http://site-shop.xyz/yugioh_over_the_nexusea908.pdfIn PDF document text
    • https://kujibolivobukib.weebly.com/uploads/1/3/1/1/131163991/tojum.pdfIn PDF document text
    • http://japadalifu.22web.org/gopupud.pdfIn PDF document text
    • https://cdn.sqhk.co/sunomedude/H0ieLgj/13188892450.pdfIn PDF document text
    • http://vehicleinsusa.com/wixulubefilawesuxesudafyeng.pdfIn PDF document text
    • https://jerolukemotib.weebly.com/uploads/1/3/0/8/130874115/f645f8.pdfIn PDF document text
    • http://polikarmonolit.ru/zisogavibopomizifijodotuwvjarv.pdfIn PDF document text
    • http://fineagencyy.com/sertifikat_akreditasi_ban_pt_uns6mn5f.pdfIn PDF document text
    • https://rizedugo.weebly.com/uploads/1/3/1/4/131453818/c4d01c8e1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/zafaronivaj/gekinugakakudevovajo.pdfIn PDF document text
    • http://vedumojaje.epizy.com/bcd_format_converter.pdfIn PDF document text
    • https://s3.amazonaws.com/rivazixexuguri/ip_subnet_calculator_portable_free.pdfIn PDF document text
    • https://s3.amazonaws.com/dekogamik/increase_sound_android_root.pdfIn PDF document text
    • http://kojajopi.epizy.com/tulepojemo.pdfIn PDF document text
    • http://ximuruguj.epizy.com/44719844799.pdfIn PDF document text
    • https://s3.amazonaws.com/zoromexemuzid/ordering_fractions_worksheets_5th_grade.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5E 5452 bytes
SHA-256: 4aa1e7feb618ae0b1986e63593c1ea50938f1f758ab8df71bc3d6f64b9496230
font_01_sfnt_off0000f0f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F8 10216 bytes
SHA-256: 1936111beb6d032c2f561ff9545dcb8aece38d4adf7cd03e8c0e9279602c545f
font_02_sfnt_off000113ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113AC 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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