Malicious PDF — malware analysis report

Static analysis result for SHA-256 23ad8505175d796c…

MALICIOUS

PDF

77.0 KB Created: 2021-03-29 01:42:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: fdf4182b830aeb222adb26f3f0564389 SHA-1: 081bb04fb38022e02ccc94296af74197c884b781 SHA-256: 23ad8505175d796c02778a2253dc53af440da6cef11be8d4e06638038a2e9a06
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDFs, indicative of a link farm or a method to distribute malicious content. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of embedded URLs and the PDF structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://lozipotod.ru/123?utm_term=beetle+bug+2+full+version PDF link annotation
    • http://bibopasaxuvibu.mypressonline.com/uc_berkeley_campus_map.pdfIn PDF document text
    • http://lutirojibafap.sportsontheweb.net/collection_framework_in_java_ebook.pdfIn PDF document text
    • http://fisujerekuvij.getenjoyment.net/writing_task_1.pdfIn PDF document text
    • http://danoguvokapijof.medianewsonline.com/biology_notes_for_class_10_icse.pdfIn PDF document text
    • http://sejujanovemo.medianewsonline.com/90539127793.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376850/normal_6006b335179c5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413469/normal_5fcaf5be9cb09.pdfIn PDF document text
    • http://tamakedesununod.mywebcommunity.org/butomujukev.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424029/normal_5ff0e649cbe78.pdfIn PDF document text
    • http://dilawiputonu.mypressonline.com/frosty_the_snowman_original_song_lyrics.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wutisigila/dikaxozuvuzutitut.pdfIn PDF document text
    • https://f1801c53-b3f5-4b94-a9b3-4bb8eb376a66.filesusr.com/ugd/af633f_2d022ec5797a42a4ad1ee8addc79acbb.pdf?index=trueIn PDF document text
    • https://c6506652-bf5e-4f52-be36-03dbfaede22c.filesusr.com/ugd/f74919_71a38f579d304de8b8d9bf76d7711d26.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tobobowu/radokezetoju.pdfIn PDF document text
    • https://s3.amazonaws.com/nitidadufetenu/balancing_chemical_equations_worksheet_middle_school.pdfIn PDF document text
    • https://s3.amazonaws.com/nakuzafol/gabilosototoze.pdfIn PDF document text
    • https://s3.amazonaws.com/vovopafubipu/sibegofidodupasu.pdfIn PDF document text
    • https://50037ee0-0691-4a53-bdc2-b2f8f795cfa6.filesusr.com/ugd/b41a9a_2ae032de97c4416d822cfaa2c1e92140.pdf?index=trueIn PDF document text
    • http://jamenajiko.myartsonline.com/cbse_class_12_sample_paper_2020.pdfIn PDF document text
    • https://02bc4616-4eae-4b38-b2c9-0e654f754ee0.filesusr.com/ugd/069df5_9ae3b184364d4daaa08454c8abea3e4e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jevopemosod/xukoguramexexobakatekuti.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
font_00_sfnt_off0000ef39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF39 5108 bytes
SHA-256: 6ab3cdd177bc77a1d8838385922dff5567c4e9d501d1a038a398f25f081196fb
font_01_sfnt_off000100c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C3 11148 bytes
SHA-256: 81ca4b338094de3c71657ba50efe8942ae682a1169abfedc8686077f60bb7bed

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