Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b19fa33eca7b79e…

MALICIOUS

PDF

76.3 KB Created: 2021-03-16 07:03:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: b21a2dcd3bdb29e79df3097bd30dda41 SHA-1: 7eba83e3a1cd680edb4a6bf644bb6d9f9f74f11d SHA-256: 8b19fa33eca7b79e2c1a9d549335cb5c3b0c1e16024676fb2544edffca7f1b94
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.
  • 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://pelibifir.ru/wix?keyword=juarez+lincoln+high+school+phone+number PDF link annotation
    • http://wikowezenitezo.medianewsonline.com/lipuzalefofuginuposoku.pdfIn PDF document text
    • http://eushopvmn.site/wexodenibokoff0civ.pdfIn PDF document text
    • http://arevakar-travel.com/103502785382uqnb.pdfIn PDF document text
    • http://tinesemexogo.mygamesonline.org/capellania_juvenil.pdfIn PDF document text
    • http://gatorama.site/what_is_frayer_model_vocabulary_templatenwrqa.pdfIn PDF document text
    • http://profoto22.ru/questions_to_make_you_fall_in_love_new_york_times4ex56.pdfIn PDF document text
    • http://sabumow.mygamesonline.org/20043439182.pdfIn PDF document text
    • http://goodshopsales.xyz/24817232644ddndq.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/9199b922-60a0-439c-9c21-dd765a81f39e/sekasobunutirafivuxadak.pdfIn PDF document text
    • https://436240a4-ef10-404e-ad90-c5cab949c7af.filesusr.com/ugd/3fb742_ef7330d34d664435be58b503308218bd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/caab24a6-1ac7-4df1-a48a-ff73e4c2e30c/focusrite_scarlett_solo_2nd_generation_driver_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90fa626d-e012-4e1d-8f44-8688f6e1fc64/cutest_pics_of_baby_yoda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c266d355-c8b0-4cfc-a7be-9abe071c4ea1/bausch_and_lomb_antique_microscope.pdfIn PDF document text
    • https://128fc002-9ed4-4a8f-9a6b-83b43563a9ed.filesusr.com/ugd/6812d7_d3d36aacced64f12a7f9e5928aaf6e14.pdf?index=trueIn PDF document text
    • http://xiniwipilanaju.atwebpages.com/brecht_galileo_galilei.pdfIn PDF document text
    • https://s3.amazonaws.com/xarojapi/car_magazine_south_africa.pdfIn PDF document text
    • https://2f2ab42d-e0b4-4bd3-aa50-2430da1ff5fc.filesusr.com/ugd/eaf48f_1aff9484d08f4afeb1f24dd8474dbdca.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jupudizadid/matlab_function_in_script_file.pdfIn PDF document text
    • https://s3.amazonaws.com/pisik/sapuzosudukavelufopofugi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/caee450d-6806-4b50-a4ca-4b1d59af3bfb/veruca_salt_song_charlie_and_the_chocolate_factory_musical_lyrics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4e76ca8-c85f-44ae-bdf2-a6073a3b08f5/arabic_alphabet_song_learn_with_safaa.pdfIn PDF document text
    • https://8607b5f8-c2b2-49b7-a314-b17bd4efff40.filesusr.com/ugd/d99252_7eb8a6792d944982a778f3228c9e474f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4f6e396-ec5f-4a99-bb8f-a394ba8077d5/the_house_of_bernarda_alba_full_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/julexekubaj/fly_fishing_guide_corpus_christi.pdfIn PDF document text
    • https://4121a797-204a-431c-92a8-8e24072fb342.filesusr.com/ugd/b972d5_3f77e2f01cdc4deb8ace77d993a7db69.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/041b64c5-268a-4c38-a347-47bc556af061/up_from_slavery_movie.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_off0000ee7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7C 5524 bytes
SHA-256: f36119196738fc3f381f5e3eb24a0011a35f27802a42dc2eed90615c30db0725
font_01_sfnt_off0001011e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011E 9916 bytes
SHA-256: 8fc8fe2c8690b6dce0b6be2d14b9b56752e1fd9e35738fb936a0e92d5603b078