Malicious PDF — malware analysis report

Static analysis result for SHA-256 03a3903a02dbd11c…

MALICIOUS

PDF

79.7 KB Created: 2021-03-18 00:14:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: f2979e3d68e91cd392229ad535ab488c SHA-1: d97a2402d72e90e9a6d19808fff5c9e394ffc809 SHA-256: 03a3903a02dbd11c9d11b66da00c2a70d3582433430bc7a62e57f846a33a4699
244 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. One critical heuristic identified links to known malicious redirector infrastructure, suggesting an attempt to lead users to malicious sites. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/123?utm_term=mustache+template+java In PDF document text
    • https://dixudijoketaf.weebly.com/uploads/1/3/4/6/134661748/munixegogif.pdfIn PDF document text
    • https://tuvukorop.weebly.com/uploads/1/3/1/8/131857527/818bc47c2ba.pdfIn PDF document text
    • https://xonokuraku.weebly.com/uploads/1/3/3/9/133988937/d77628bf.pdfIn PDF document text
    • https://cdn.sqhk.co/risubibasero/F4yjhc8/65067837774.pdfIn PDF document text
    • https://nuxaluvuwij.weebly.com/uploads/1/3/5/9/135997537/wupudegofoxaf_vawiresonuvoka.pdfIn PDF document text
    • https://gobadelo.weebly.com/uploads/1/3/4/5/134594664/fenariral.pdfIn PDF document text
    • https://cdn.sqhk.co/raguwubives/jjhaQWn/45877299992.pdfIn PDF document text
    • http://bibopasaxuvibu.mypressonline.com/vopumaxuxifedejafof.pdfIn PDF document text
    • https://cdn.sqhk.co/xulawajikigi/gigghi5/23102252342.pdfIn PDF document text
    • https://cdn.sqhk.co/serojimo/agdghcj/pub_story_bar_renovation_breaker_games.pdfIn PDF document text
    • http://tojuvapemupo.mywebcommunity.org/himno_al_maestro_el_salvador.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vidilig.onlinewebshop.net/86715570615.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd906cfe-44c9-4750-98d1-750fa8d09163/zakosevivokijokovezu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/340ce4c4-c60e-4612-8c7d-aa20907f9a37/apollo_horticulture_grow_tent_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fae5f0a-2698-49d1-8b7d-ba4a56019e3f/22946418733.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/838e82c7-28d9-41a2-93b5-980785cbce88/el_club_de_los_poetas_muertos_descargar_libro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4048a98b-7d98-4724-8709-282d8509fc1c/samsung_dv210aew_xaa_not_starting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95e674b7-0bc1-403e-92ad-2ba8f3db917b/samsung_smart_tv_55_inch_4k_price_in_india.pdfIn PDF document text
    • http://gixarewujedel.atwebpages.com/72587748450.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2889612c-4d6f-4166-af6e-9cb6ef80e275/66880056514.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9876961-072d-499f-a026-630ab62375c0/honeywell_rpls740b1008_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/714c286f-388b-44a6-9e5f-f9c29a420f60/how_do_i_check_ink_levels_on_my_epson_2750_printer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4de6320d-4d97-4fe9-8871-98157307f3aa/dark_beginning_2_release_date.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/602ca31e-72ed-4ca3-9ba7-0825a759e9f4/62255895516.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_off0000f681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF681 5216 bytes
SHA-256: c32cede7307bb741b3d8b95fb8c756b7e173e668cd452a6401e5e72f7edbf13d
font_01_sfnt_off00010833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10833 11728 bytes
SHA-256: 49581eb1ccb14ed684ec174793e60a22bc45c06cafd52f1ae09ba0cdfdbce655