Malicious PDF — malware analysis report

Static analysis result for SHA-256 88fe433be9aad07d…

MALICIOUS

PDF

74.9 KB Created: 2021-03-10 05:50:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 2530a44900093bdc4006d0189882ed5b SHA-1: c9d5181de5ca21e1a0d0bfea8bf0891bd701b232 SHA-256: 88fe433be9aad07d24ddd0a75ea58aba7d8513e33fe7f12bf128ab83a7a7ca27
186 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 disposable domains, indicative of a link farm designed to manipulate search engine results or host phishing content. ClamAV detection and ML classification strongly suggest malicious intent, likely related to phishing or malware distribution via these external links. No scripts were extracted, but the PDF structure itself is the attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • 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://soxebez.ru/123?utm_term=measurements+worksheets+2nd+grade PDF link annotation
    • https://wugumura.weebly.com/uploads/1/3/4/6/134601103/lebak.pdfIn PDF document text
    • https://voxonevixes.weebly.com/uploads/1/3/4/3/134383310/9993c9b.pdfIn PDF document text
    • http://mabay.fun/drumsticks_on_the_grill_indirect_heat8puet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376601/normal_5fd0356eb7c8c.pdfIn PDF document text
    • http://marafonsport.site/how_do_i_get_an_iatf_certification3vmta.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473651/normal_5ff78ed82b7e4.pdfIn PDF document text
    • http://marketitaly.info/oxford_picture_dictionary_ebook_free6plc3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466662/normal_601c8a25ea62a.pdfIn PDF document text
    • https://xegoratan.weebly.com/uploads/1/3/2/7/132712572/kafetekafitedis_gupawijosir_dulivoxipi.pdfIn PDF document text
    • https://vanixegufewip.weebly.com/uploads/1/3/4/5/134511125/nepamekerofedi.pdfIn PDF document text
    • https://muxiduxipa.weebly.com/uploads/1/3/5/3/135319221/sagupegutabuxokupek.pdfIn PDF document text
    • https://wefizaxire.weebly.com/uploads/1/3/0/9/130969527/rolekutetukiwofoso.pdfIn PDF document text
    • http://ezfix.asia/academic_english_reading_and_writing_across_the_disciplines_2018_free_download72je4.pdfIn PDF document text
    • https://jiwumakot.weebly.com/uploads/1/3/4/2/134235931/pemitusonarov_bovoxamu_wirajatum_jafezuku.pdfIn PDF document text
    • https://bifotuvimutojuz.weebly.com/uploads/1/3/0/9/130969437/bagud-fedumuv.pdfIn PDF document text
    • http://dayzcommunity.info/wokisipizadewt9agz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470825/normal_5fe717a29fc6e.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/5ed05deb-9654-4c22-92e8-73779ae9b4ac/31714240217.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89798b4f-d5ae-490d-b64b-328981ce19a2/how_to_make_second_page_number_1_in_word_mac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8514e40b-6014-4b25-9dea-c4ad8f61eaff/75147700759.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43258c04-53d1-42b1-b1ed-9de33ed2e3c4/xidonakekite.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/901582ba-648a-4313-921f-12b72b1fd512/how_to_send_a_video_in_messenger_exceeding_25mb.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_off0000e738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE738 5500 bytes
SHA-256: db991778b9516640de1967ee6c4784ec8a60f0321686f5bdf0df3db4464902d0
font_01_sfnt_off0000f9e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E5 10588 bytes
SHA-256: f9955a28e3e6b7db397cf1f24267f1a051a52f792d3cc918006a1cdd0b6efc9c