Malicious PDF — malware analysis report

Static analysis result for SHA-256 6637843806ff8c5a…

MALICIOUS

PDF

75.6 KB Created: 2021-03-09 19:36:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 380f46d507ce26b37aaf39d8df04052b SHA-1: 7704b37dd8a4c3b0d7dc486bead4bafe968c4554 SHA-256: 6637843806ff8c5a62492723f18f64c7fb045b977e2d0bb30de60430af82d3b2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating it is likely a phishing or malware distribution lure. It contains numerous external URIs pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and contains metadata indicating it was generated by wkhtmltopdf, a tool often used to create PDF documents from web content, further supporting the lure hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://gimoguvi.ru/award?keyword=love+marriage+vs+arranged+marriage+essay+pdf PDF link annotation
    • http://gapagal.mywebcommunity.org/mariage_d_amour_score.pdfIn PDF document text
    • https://molilavavabofu.weebly.com/uploads/1/3/5/9/135989114/fojakezagapedi-dedepab-jexugetu.pdfIn PDF document text
    • https://barurusijibipek.weebly.com/uploads/1/3/0/7/130740419/07b7f385c.pdfIn PDF document text
    • https://cdn.sqhk.co/dedogupazib/jh0ChiM/extreme_bike_racing_games_free_download.pdfIn PDF document text
    • http://lowafax.22web.org/poweredge_r740xd_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/pulazapusaw/jdmJuw1/21392991077.pdfIn PDF document text
    • http://jabilevij.mypressonline.com/kenmore_model_158_sewing_machine_manual_free.pdfIn PDF document text
    • https://bibatajikoxego.weebly.com/uploads/1/3/5/3/135315017/2ef9b1068cdafc2.pdfIn PDF document text
    • http://netekepipavosis.sportsontheweb.net/98220175178.pdfIn PDF document text
    • http://zenajok.medianewsonline.com/what_is_a_line_of_argument_in_an_essay.pdfIn PDF document text
    • https://vukuzimina.weebly.com/uploads/1/3/4/1/134109202/1a9d65e002b.pdfIn PDF document text
    • https://nasoxatexiwek.weebly.com/uploads/1/3/0/7/130739087/c34bf2d763.pdfIn PDF document text
    • https://cdn.sqhk.co/towinomer/NnYmqjg/final_fantasy_xiv_how_to_get_chocobo_companion.pdfIn PDF document text
    • https://cdn.sqhk.co/kogewole/gelIQIW/the_maze_runner_full_movie_youtube.pdfIn PDF document text
    • https://cdn.sqhk.co/rolekixawute/Dihhehj/getepuwovitogeninarobeviv.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/125206cc-ccab-4056-aaf1-c976225ad23c/bemon.pdfIn PDF document text
    • http://fotopokidag.epizy.com/philips_respironics_system_one_bipap_service_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77331fcf-ddd6-44ed-8488-d24755b83922/peterson_field_guides_stars_and_planets.pdfIn PDF document text
    • http://vebusatoro.atwebpages.com/44717903895.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e36eb20a-521f-4bcd-9ea1-11f496a5fdba/reading_like_a_writer_mike_bunn_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52ceba49-3d7c-4157-9f5f-35af0bd7512e/lexus_es300_battery_location.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_off0000ea79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA79 5432 bytes
SHA-256: 10304b26cdef841f6d898cf0b3b678fb3337c4a7cbbd01e0dae4a73ffa911999
font_01_sfnt_off0000fcef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEF 10492 bytes
SHA-256: 170d8df29ccaa7b274e820924b6a03699c80d91144b54efb293bfc59e5c9fe5b