Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec6d16ad135d3b79…

MALICIOUS

PDF

90.6 KB Created: 2021-03-22 13:17:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 679a9ab1a72127a27a44a9c37b7c0f9a SHA-1: 200c2e2847292824e029babcc44f5f805489e1e3 SHA-256: ec6d16ad135d3b79892309a3029bb93509715b91275b6fc6586270456ef09794
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector and another for a large external PDF link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO manipulation. While no scripts were directly extracted, the PDF structure and link farm suggest an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9904

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://yafferge.ru/aws?utm_term=realtek+audio+driver+macbook+pro+windows+10 In PDF document text
    • https://bododomeliba.weebly.com/uploads/1/3/1/4/131408614/2977212.pdfIn PDF document text
    • https://rokubupudila.weebly.com/uploads/1/3/1/8/131856034/4744d859d9b.pdfIn PDF document text
    • https://ranekiwoj.weebly.com/uploads/1/3/0/8/130814960/suwubiwelipix_xezopagegazedux.pdfIn PDF document text
    • https://zodefamebatum.weebly.com/uploads/1/3/5/9/135967531/8660f6966834.pdfIn PDF document text
    • https://kosonajiwepojig.weebly.com/uploads/1/3/4/3/134373389/8011272.pdfIn PDF document text
    • https://munipepuxorikoz.weebly.com/uploads/1/3/0/9/130969311/gekobufebaxiziji.pdfIn PDF document text
    • https://tafugamukizigip.weebly.com/uploads/1/3/0/7/130775106/venaro_dusadabidora.pdfIn PDF document text
    • https://vavujajakakef.weebly.com/uploads/1/3/0/7/130740385/665289.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/dorulusof/pearson_active_learn_answers_science.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f4d4cc8-e716-4cab-931a-8c0798224acd/42496715477.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f53851fe-9eb3-44cd-9850-2fad507b6d01/what_is_the_definition_of_dramatic_irony_in_literature.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84fa8cfc-5487-466b-8ced-3d29cb6e2f2d/how_many_chapters_does_artemis_fowl_book_1_have.pdfIn PDF document text
    • https://s3.amazonaws.com/pegebunov/bobifupupudulo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63e1390d-f0b7-4469-bb8a-44d3b3502c9e/pipavurixegitukaked.pdfIn PDF document text
    • https://s3.amazonaws.com/baxegezivumi/pdf_to_word_editable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f141c1c-f0a4-49bd-b439-ea466757cff1/disuzakafovavulur.pdfIn PDF document text
    • https://s3.amazonaws.com/rexogeguxosix/nafixatodepudiwisasoluw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bb74024-722f-44ab-b64c-61bc11c8fd72/47018451490.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a26860e-cbb3-4a83-9322-ebc6fe742030/4260658375.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzotisenixava/vukufupabeku.pdfIn PDF document text
    • https://s3.amazonaws.com/tasufagijaremo/37777552946.pdfIn PDF document text
    • https://s3.amazonaws.com/kozibowisenatu/arial_otf_bold_font_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zubuwujoxom/zorikokuwukugumunoxome.pdfIn PDF document text
    • https://s3.amazonaws.com/sefipa/64714412661.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f0a4001-a3ed-4b47-b4e6-0f7f66d3db8d/what_does_the_maintenance_required_light_mean_on_a_2003_honda_accord.pdfIn PDF document text
    • https://s3.amazonaws.com/zafijukopa/anjali_anjali_song_mp4.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8C 5656 bytes
SHA-256: 535a6ba3786812155512f4fb9221cb820f403c69e90ff9f0a4f552bcee02ef6c
font_01_sfnt_off000112c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C4 11196 bytes
SHA-256: 6a6751a688ddcc67654691c14ab436168d62fc631ad6f3da59eb6d1079f39730
font_02_sfnt_off0001390e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1390E 16060 bytes
SHA-256: 503f5200e83b189a546b6c6e1d808633a9135186956fe76ff9bd78de3d91e3c6
font_03_sfnt_off00014da6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DA6 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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