Malicious PDF — malware analysis report

Static analysis result for SHA-256 c45d7549da5cb857…

MALICIOUS

PDF

74.5 KB Created: 2021-03-28 21:44:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: a59a52a8490f82e09a97a28dd08107bd SHA-1: 58361faaf262431e6479241538f295982eed3604 SHA-256: c45d7549da5cb85728c556a10a289a854066bc220e3970a68743e70e777bf837
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 0.9998

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://dafemum.ru/award?keyword=el+poder+curativo+de+la+cabala+pdf+gratis PDF link annotation
    • http://nejupike.mygamesonline.org/reset_liftmaster_keypad_model_877max.pdfIn PDF document text
    • http://sogejovep.mypressonline.com/because_he_lives_hymn_lyrics.pdfIn PDF document text
    • http://zonerokemub.getenjoyment.net/how_to_cut_triangles_for_a_quilt.pdfIn PDF document text
    • https://jividakole.weebly.com/uploads/1/3/6/0/136090299/913933.pdfIn PDF document text
    • https://jubolovewo.weebly.com/uploads/1/3/1/4/131453214/jumat.pdfIn PDF document text
    • http://dalifajebuxog.scienceontheweb.net/72462202205.pdfIn PDF document text
    • https://nuwofukejixi.weebly.com/uploads/1/3/1/4/131437867/susosulamasobivupu.pdfIn PDF document text
    • https://labopepiw.weebly.com/uploads/1/3/4/7/134747507/kibegadovujegasufow.pdfIn PDF document text
    • http://ponaxamewimenul.sportsontheweb.net/85365658157.pdfIn PDF document text
    • http://nogurufegu.mygamesonline.org/possessive_apostrophe_worksheet_with_answers.pdfIn PDF document text
    • https://kowuzuworos.weebly.com/uploads/1/3/2/6/132682574/lumaja.pdfIn PDF document text
    • https://romevezijije.weebly.com/uploads/1/3/4/7/134756673/gujato.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/f381ca6a-68b5-40f8-9417-428efaccbda9/basic_computer_skills_windows_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/489e5168-3c5c-4ef5-a147-9a3758913ac4/song_end_of_the_world_skeeter_davis_lyrics.pdfIn PDF document text
    • http://merapenerabari.myartsonline.com/37737801852.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ab9fd90-9400-4dea-be9c-5ea8bc77ae7d/short_paragraph_on_dog_for_class_4.pdfIn PDF document text
    • https://s3.amazonaws.com/niporofez/que_lleva_un_botiquin_de_primeros_auxilios_basico.pdfIn PDF document text
    • https://s3.amazonaws.com/punagilelabon/shirley_ryan_abilitylab_formerly_ric.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD7B 5480 bytes
SHA-256: 0b526cbd9f5a81f83904fe1126ca735f509b639d0545862a442ce7b2869ceb0d
font_01_sfnt_off0000e02f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02F 11536 bytes
SHA-256: 79f210adaca14e232fbaf4e6f6b190f2dadf01adc9b63e7b6d539dd9360594f0
font_02_sfnt_off000105ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BA 16140 bytes
SHA-256: 159427b32ed66bfbde86def5e6c2992bde67dfb25400c4000a37c9b59b949b61