Malicious PDF — malware analysis report

Static analysis result for SHA-256 39ef94de7f718d25…

MALICIOUS

PDF

78.0 KB Created: 2021-05-30 16:36:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 86645ac2b35c9a1e2a32cf7d6ee9199e SHA-1: d825645e0feb3575ea9a2dee60c972e9c6cdb99f SHA-256: 39ef94de7f718d2571ebae8e3c3aca49f4781b17056855d9e706d7ae5c0309e3
172 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1204.002 Malicious Link

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating it is a phishing or trojan. The document body and heuristics suggest a lure for cracked software downloads, specifically mentioning 'Quickbooks pro 2016 crack serial key free download'. It contains a link farm with numerous external PDF links, including one pointing to a malicious domain, and a specific URI related to downloading cracked software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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/strik?utm_term=quickbooks+pro+2016+crack+serial+key+free+download PDF link annotation
    • https://xisuviwilizej.weebly.com/uploads/1/3/4/3/134320176/zelob-varamekiro-loserop-roxonetuwinukoz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4530990/normal_5fdf02363dd16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376625/normal_6065bf1127077.pdfIn PDF document text
    • https://sobiwololisa.weebly.com/uploads/1/3/0/9/130969717/xixatutawob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375504/normal_603565707b87a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455399/normal_5fcaa329aaba9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370762/normal_600296c9be332.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/344edb09-5369-43b9-a29e-dcfe0878339c/download_game_yugioh_forbidden_memories_2_for_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05c3fd1d-d7e6-44da-a481-4dceee56f2a9/37030374469.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef5afbaf-cb38-471b-bd4e-eb1ac230da33/54752673559.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fcf4677-1d1a-4e4a-a3b2-6e09ca9b31e4/mepojesesunudu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e060199-5c1a-4664-b5d7-079f19eb6ed3/english_translation_of_the_holy_quran_by_abdullah_yusuf_ali.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/419ed350-88d3-4a3b-bb21-e13f0331fd3a/90468894726.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f452fdcd-9150-4320-9901-3180240144e8/adobe_premiere_pro_cc_2017_free_download_softonic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63bb3039-8973-4f41-8936-49d53348a19f/the_bluest_eyes_toni_morrison_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c694690-d60b-45cb-826f-e77e22475dad/junuxajugizupeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52671936-7ec1-4857-b3ff-ac3a748096e5/65496234783.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00010475.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10475 11156 bytes
SHA-256: ca0f8afdf52dc556a4d45d583faccbbccf5de5277bd4495ef8df222d314eea28
font_00_sfnt_off0000ef98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF98 6088 bytes
SHA-256: 4e627164d2f7816a2274857f7d24e2068241ba2caaae26152513f694958518d8

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