Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3b6a441d744124f…

MALICIOUS

PDF

75.7 KB Created: 2021-01-28 22:58:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 6dc542886f8ed1c26d5b07faa167a0c8 SHA-1: 4e8ba7694e8ef58a7eac2036caca6f987602edf3 SHA-256: d3b6a441d744124f162a8d750cf315cb2ffea49374794ed4c481a01854eae365
214 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external websites. One critical heuristic indicates that the PDF links to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the sheer volume of links and the presence of a malicious redirector suggest an attempt to phish or deliver a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wb?keyword=sputnik%201%201957%20facts In PDF document text
    • https://lopiranurepo.weebly.com/uploads/1/3/4/7/134735856/vuzixubago_tonaridix.pdfIn PDF document text
    • https://dagigofeno.weebly.com/uploads/1/3/4/8/134887245/kovudibumus_bulujanelosori_riwibabuk_mojakotupow.pdfIn PDF document text
    • https://dufebekeromodi.weebly.com/uploads/1/3/0/7/130776386/1917577.pdfIn PDF document text
    • https://donurufeto.weebly.com/uploads/1/3/4/8/134898164/xukesirem.pdfIn PDF document text
    • https://pawonojureva.weebly.com/uploads/1/3/4/5/134522231/56e8b6c0.pdfIn PDF document text
    • https://xedafiwiwez.weebly.com/uploads/1/3/2/3/132302754/6b8a4e.pdfIn PDF document text
    • https://tojemiwavujiguv.weebly.com/uploads/1/3/4/4/134468879/877187.pdfIn PDF document text
    • https://rigugoxa.weebly.com/uploads/1/3/0/7/130776225/1816012.pdfIn PDF document text
    • https://bofujobepoj.weebly.com/uploads/1/3/1/1/131164048/girazuwosaxuwonimaw.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/mulerux/chrome_portable_zip.pdfIn PDF document text
    • https://s3.amazonaws.com/zerepuzuze/mazegegagojexe.pdfIn PDF document text
    • https://s3.amazonaws.com/kaxukok/zejubitofututegudir.pdfIn PDF document text
    • https://s3.amazonaws.com/tisegovofu/app_store_on_ipad_mini.pdfIn PDF document text
    • https://s3.amazonaws.com/liwara/gaviboxajadadupirofug.pdfIn PDF document text
    • https://s3.amazonaws.com/somamere/6865831273.pdfIn PDF document text
    • https://s3.amazonaws.com/nuvukivaxiren/bachelor_of_science_in_business_information_systems.pdfIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/patchvalue_formarray_angular.pdfIn PDF document text
    • https://s3.amazonaws.com/xeruxaxer/tibosififipujotisajixafa.pdfIn PDF document text
    • https://s3.amazonaws.com/mufukep/introduction_to_computer_science_using_python_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/vonuxagupeduze/cardiac_enzymes_normal_values.pdfIn PDF document text
    • https://s3.amazonaws.com/jebupofedijakuk/fly_sheets_canada.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_off0000dd72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD72 5112 bytes
SHA-256: fec7487d3659b37c2eb5dba62210aa7ffc72afb8b5a003be880b32f029b845da
font_01_sfnt_off0000eef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF7 10568 bytes
SHA-256: 1d999ed5c9a2dbb9b7fc2d0f806c346f1036829bdd10b000f80f414f69931764
font_02_sfnt_off00011343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11343 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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