Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf112a32bc9c893f…

MALICIOUS

PDF

80.4 KB Created: 2021-04-22 03:11:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 86e92dcc5844261e1e06eb6c2484e1f0 SHA-1: dc807c09327236eb4a43f773551f1b540ba143e5 SHA-256: cf112a32bc9c893f940ddbffab69d6c0e21857767b1774d52dc45e103ae06396
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 0.9995

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://bologen.ru/strik?utm_term=one+of+us+is+lying+addy+character+traits PDF link annotation
    • https://gomafaned.weebly.com/uploads/1/3/5/2/135296522/5976768.pdfIn PDF document text
    • https://witabavuwimob.weebly.com/uploads/1/3/4/3/134339013/66bd5b82c6f.pdfIn PDF document text
    • https://bogekivusuwi.weebly.com/uploads/1/3/4/6/134604255/bc652da.pdfIn PDF document text
    • https://cdn.sqhk.co/temokika/bPyMrE7/steel_i_beam_weight_calculator_inches.pdfIn PDF document text
    • https://fonekukiko.weebly.com/uploads/1/3/5/3/135393218/7141546.pdfIn PDF document text
    • http://hushseo.online/brother_mfc_6490cw_prixid48a.pdfIn PDF document text
    • https://cdn.sqhk.co/vuzowadijavu/wih4jij/solitaire_ring_meaning_in_urdu.pdfIn PDF document text
    • https://nemamalalebu.weebly.com/uploads/1/3/4/3/134357173/nijeritile-sanigapitexi.pdfIn PDF document text
    • https://cdn.sqhk.co/xudekutof/gha8CZw/find_my_android_phone_app_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/zubavagi/WhgSWOV/roxatejirisuwuvowibo.pdfIn PDF document text
    • http://gprofights.ru/how_to_fix_wireless_earbuds_not_chargingwzei1.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/732da3f3-ec3e-46c7-a4cc-7ba563530a86/47562853737.pdfIn PDF document text
    • http://tifimetevi.rf.gd/be_here_now_ram_dass.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0952c01-0571-4cfe-ad7f-ce3b8acf1144/book_of_job_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2be07d8-fc40-4b76-bd9e-2f0c4fa1bdd8/27598477521.pdfIn PDF document text
    • https://s3.amazonaws.com/najubu/search_briggs_and_stratton_by_serial_number.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a976a6a-76d1-47ee-aa5d-5fe8d7d858bd/how_to_make_a_girl_want_you_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18c07740-0a82-4189-8a86-d8b443e5c22e/20841262567.pdfIn PDF document text
    • http://ritazedaji.epizy.com/walmart_covid_vaccine_florida_sign_up.pdfIn PDF document text
    • https://s3.amazonaws.com/libowebujakux/45354523772.pdfIn PDF document text
    • http://tinodaxaxaduj.rf.gd/canon_rebel_xti_instruction_manual.pdfIn PDF document text
    • http://semozogeteveka.rf.gd/bookmark_origami.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE24 6440 bytes
SHA-256: 2ce5a7286efefc5aae27ce1c31b3347e159d00bd30cf97f509a0b7f7d49caffb
font_01_sfnt_off0000fe19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE19 5412 bytes
SHA-256: a6a31cbbd1ff32c9a79b45582541f6c875715b1c07f00458b4f476f0e5fff31a
font_02_sfnt_off00011087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11087 10244 bytes
SHA-256: 1329e6d36331339a5a71ed0404524673a9d1876d58fdb9b5ae158eb7e0c69b75