Malicious PDF — malware analysis report

Static analysis result for SHA-256 dde7b895e4e18f2f…

MALICIOUS

PDF

80.1 KB Created: 2021-03-02 18:08:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: c3dbd32fc6fc11e72c12253a31b6b104 SHA-1: 4b33bb3a912e76ccb2a4d1a147f42f63cb88dcad SHA-256: dde7b895e4e18f2fa5e91790117260df258e89d2665a9a2a26f90db2322ddf2a
194 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, containing numerous external URIs pointing to various websites, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a 'download button' lure further supports a malicious workflow.

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://ponafet.ru/123?utm_term=me6014+computational+fluid+dynamics+notes+pdf PDF link annotation
    • https://bomexufimewaw.weebly.com/uploads/1/3/4/5/134517434/7fb1482b6.pdfIn PDF document text
    • https://famimiketavow.weebly.com/uploads/1/3/0/8/130873946/b5597c06e33.pdfIn PDF document text
    • http://gebevojika.mygamesonline.org/a_dolls_house_quotes_about_gender_roles.pdfIn PDF document text
    • https://razesupimo.weebly.com/uploads/1/3/2/8/132815812/5681035.pdfIn PDF document text
    • https://xebuvimujutil.weebly.com/uploads/1/3/6/0/136050287/xebiwowidex_rokizikigade_muvefalugas.pdfIn PDF document text
    • http://lamaded.mywebcommunity.org/betesu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373301/normal_5fcc6de083f10.pdfIn PDF document text
    • https://luwimaxilonava.weebly.com/uploads/1/3/4/7/134772317/satabaraze.pdfIn PDF document text
    • http://kazexezawulozij.mypressonline.com/83082326161.pdfIn PDF document text
    • https://xawavefite.weebly.com/uploads/1/3/4/6/134667803/5491796.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385415/normal_6013c52b538fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367947/normal_601fbd2260c5e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489993/normal_6005424117945.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443799/normal_601cecbf6b5fe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467036/normal_60035de739515.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
    • http://wonanikapudidak.atwebpages.com/zelanunigoropas.pdfIn PDF document text
    • http://kopolug.myartsonline.com/homedics_personal_portable_ultrasonic_cool_mist_humidifier_reviews.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_off0000e991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE991 5632 bytes
SHA-256: f8ab51d8415cd0e7b14f57f974129e2a54a6da8fb1524e4938fb0a70f6ff5d7d
font_01_sfnt_off0000fcb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB3 11788 bytes
SHA-256: 0b30d5cdfd8881debcddf05d9328e4a9a7b2990c4243d6bfdf6d21bb4cea4857
font_02_sfnt_off000124fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124FE 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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