Malicious PDF — malware analysis report

Static analysis result for SHA-256 c05a2b9500e5fe64…

MALICIOUS

PDF

87.8 KB Created: 2021-03-26 06:44:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 179059f2475781ebb35f6330b9d7d222 SHA-1: 0e265b7cacc1b4f9fc42faf2ef28b3f4d19cb3c9 SHA-256: c05a2b9500e5fe6432493c72b6839228a830a65e898653bbef129116d6ed7389
194 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and exhibits characteristics of a link farm, with numerous external URIs pointing to potentially malicious content. The presence of a 'download button' heuristic suggests a lure to trick users into interacting with the document. While no scripts were directly extracted, the PDF structure and heuristics indicate an attempt to redirect users to external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wix?keyword=four+track+rental PDF link annotation
    • http://okrasote.info/nonutelekqglvq.pdfIn PDF document text
    • https://berebexamoleti.weebly.com/uploads/1/3/1/3/131384136/f9849b3.pdfIn PDF document text
    • http://hopecommunitynaz.com/eliciting_sounds_wayne_secordv8j79.pdfIn PDF document text
    • https://pokadomefodifug.weebly.com/uploads/1/3/4/4/134478187/xedab.pdfIn PDF document text
    • http://rorixuge.iblogger.org/zebasugewa.pdfIn PDF document text
    • http://hhizmet.com/my_first_100_words_flash_cards_kmartsx3z6.pdfIn PDF document text
    • https://simebusuf.weebly.com/uploads/1/3/1/4/131406507/ziduvijurup.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vovidume.epizy.com/rupunaduguledo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c2d40e4-37bf-4a9e-a60a-c1c6895ccb95/how_to_find_latitude_and_longitude_on_google_maps_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38d0ec40-0269-481b-a3a6-d233c7129f4a/jawaxulorefi.pdfIn PDF document text
    • https://s3.amazonaws.com/kaxukok/clicks_group_annual_report.pdfIn PDF document text
    • https://s3.amazonaws.com/memexelu/anodised_aluminium_sheet_suppliers_melbourne.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2f08d83-2e65-465a-8ff9-493deb88b518/is_wendys_chili_good_for_a_low_carb_diet.pdfIn PDF document text
    • https://s3.amazonaws.com/fidobakipivogit/26267163368.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68f4db42-b4a7-4773-beed-16c8b471cbe7/29060986924.pdfIn PDF document text
    • https://s3.amazonaws.com/kufazete/final_fantasy_8_official_strategy_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1e9816d-893d-4d33-8a02-59a0911f8b77/incantation_and_dance_john_barnes_chance.pdfIn PDF document text
    • http://lopusenegi.epizy.com/valajegizotabebenuxifalep.pdfIn PDF document text
    • https://s3.amazonaws.com/muvevanepen/13923109134.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00f97032-5239-472c-a770-06a4a81ab2ec/can_anyone_get_a_covid_test_in_california.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3deba699-02ab-4bc2-a721-3bf1303cb120/el_pollo_loco_menu_prices_and_pictures.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_off000119b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B1 4632 bytes
SHA-256: 2a8c13a7d354cbd7b0467747a87e09bec0c3d8c0e6c98b3f2c3f2679ecf8283d
font_01_sfnt_off00012983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12983 11388 bytes
SHA-256: 996de959cc75c6470f28094f2dc9571c8ed6e99d97e7ac468f5984dd4917a384