Malicious PDF — malware analysis report

Static analysis result for SHA-256 1659cdc157fb0b8a…

MALICIOUS

PDF

74.2 KB Created: 2021-06-12 23:20:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: fd24041483cb229c03e10a9e7cd8ba56 SHA-1: 305fbf9582ba706960c7f684bcf69367f64e4fa3 SHA-256: 1659cdc157fb0b8a92c0fb7e957749968fce5acda48bd6b9810f28025fd957a1
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing operation. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs and the 'Agri diploma online form date' text suggest a lure to redirect users to potentially malicious sites for credential harvesting or further payload delivery.

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.
  • 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://fokemale.ru/123?utm_term=agri+diploma+online+form+date PDF link annotation
    • https://lepuzabokagat.weebly.com/uploads/1/3/4/3/134333079/3916620.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424040/normal_60558d2a19fc1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389355/normal_60bc2da06986a.pdfIn PDF document text
    • https://tamukatiraf.weebly.com/uploads/1/3/4/7/134766395/riterew-sogelew-lavilarubobema.pdfIn PDF document text
    • https://jizonuwuko.weebly.com/uploads/1/3/0/8/130814311/pefefobitijixoropa.pdfIn PDF document text
    • https://xigukiburid.weebly.com/uploads/1/3/2/7/132741693/nifuve_gaveguredujir.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480878/normal_5feee90217db1.pdfIn PDF document text
    • https://gerulelib.weebly.com/uploads/1/3/0/9/130969354/xenubadiwiwo.pdfIn PDF document text
    • https://pijaxulejogelub.weebly.com/uploads/1/3/0/8/130874219/bowovim-jofudi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464083/normal_5febc2b22a11a.pdfIn PDF document text
    • https://golisarupu.weebly.com/uploads/1/3/5/3/135317681/f8a664b845.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/8130950f-7864-4de3-8e79-85f174c8efef/craftsman_leaf_blower_vacuum_bags.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c8463b8-e74f-49c0-a423-42b77d780b30/focusrite_scarlett_2i2_2nd_gen_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee1441b0-d753-42e0-a50e-e218dabca44e/46134321736.pdfIn PDF document text
    • http://podimil.pbworks.com/f/ark_survival_evolved_download_mod_apk.pdfIn PDF document text
    • http://gibuwodebu.pbworks.com/w/file/fetch/144527898/pentatonix_christmas_sheet_music_free.pdfIn PDF document text
    • http://siruzosu.pbworks.com/w/file/fetch/144802014/16839736092.pdfIn PDF document text
    • http://lulatigono.pbworks.com/f/mijelominokobipolozelixi.pdfIn PDF document text
    • http://redelaw.pbworks.com/w/file/fetch/144531879/what_are_the_topics_in_mental_ability.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a97ef675-cf05-448a-ae86-0382fd2a65f9/endnote_x7_mac_product_key_free.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_off0000e789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE789 5172 bytes
SHA-256: 3663931a1ca7fa0467e2e32560d0101ef393f4d5f0a70d2a4e4559aefb853ed2
font_01_sfnt_off0000f912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF912 10200 bytes
SHA-256: 9872c7221cc953823a98c880a1da63f0107f01fe7e8b1cf0f839e6823103b0a8