Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3d7fc8665d8e12a…

MALICIOUS

PDF

72.6 KB Created: 2021-01-24 04:59:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: f8cb807acc3e7adbee226bc42fffafbf SHA-1: f29242c44a38252bbfe7f9cd57623e0f56422ccb SHA-256: f3d7fc8665d8e12aede50da75db4df538d07144b2a8f10393709197491275d28
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links pointing to various domains, many of which are hosted on disposable or suspicious platforms. One critical heuristic indicates that the PDF links to known malicious redirector infrastructure. The ClamAV detection and ML classifier further confirm its malicious nature, classifying it as a phishing trojan. The document body is heavily obfuscated, but the presence of URLs and the link farm structure strongly suggest a phishing or malware distribution attempt.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/123?utm_term=wise+choice+process+step+4 In PDF document text
    • https://cdn.sqhk.co/tororukiwuri/Rjahc2J/theotown_city_simulation_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/dopiporajen/gihJjdC/snows_bbq_lexington_tx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486054/normal_5fd87c0d5156a.pdfIn PDF document text
    • https://fazerirusabutef.weebly.com/uploads/1/3/1/3/131381144/kebitepenowe_rimitijamamamob_tajemufoba_gufad.pdfIn PDF document text
    • https://site-1190361.mozfiles.com/files/1190361/californication_season_2_parents_guide.pdfIn PDF document text
    • https://site-1188771.mozfiles.com/files/1188771/grass_cutter_machine_honda_company.pdfIn PDF document text
    • https://site-1167950.mozfiles.com/files/1167950/transmission_jack_rental_harbor_freight.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401525/normal_5fd34f7966697.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366343/normal_5fe767f6e58ee.pdfIn PDF document text
    • https://xowunaxevome.weebly.com/uploads/1/3/4/6/134679103/7704990.pdfIn PDF document text
    • https://cdn.sqhk.co/muresogus/o3hc6jg/ear_clinic_singapore.pdfIn PDF document text
    • https://cdn.sqhk.co/nonuripot/ZYM7AMB/eqfy_equalizer_v1._1._7_paid_apk_downloads.pdfIn PDF document text
    • https://cdn.sqhk.co/vovewotutal/yiijegf/vunagafuge.pdfIn PDF document text
    • https://cdn.sqhk.co/kifuzopeko/dhchiGx/my_football_club_manager_apk_mod.pdfIn PDF document text
    • https://site-1168098.mozfiles.com/files/1168098/jafefulasifagajesiwuj.pdfIn PDF document text
    • https://fenibelamej.weebly.com/uploads/1/3/4/4/134464240/rikad-nugafafezodijan-vimose-vuviwowirolotun.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402252/normal_5fceb1d3c6b92.pdfIn PDF document text
    • https://cdn.sqhk.co/kimejijomaki/zicx0dF/primeval_movie_download_720p.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE390 4880 bytes
SHA-256: 53de6e390959b28f3597f91df8b802ecc0eaaa5008ba5dd9efc061a8a495eb0e
font_01_sfnt_off0000f440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF440 9828 bytes
SHA-256: fe2dee2ad88488a517b58032e2c28cf4811b4c26222cfd56155988bd7d66d6e6