Malicious PDF — malware analysis report

Static analysis result for SHA-256 18cbded700672a06…

MALICIOUS

PDF

79.1 KB Created: 2021-04-20 23:54:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ece812d883af51b79998a08885c97881 SHA-1: b5839167b5de094b85e3a96941c804a284f52eeb SHA-256: 18cbded700672a06d2f6a326eebe96d11e5d481d69e4584097fcee57b75c4bd2
244 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to disposable hosting and are likely part of a link farm designed to distribute malicious content. One of the URLs, dafemum.ru, is flagged as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

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/strik?utm_term=pixie+plus+singer+sewing+machine+price In PDF document text
    • http://xivokosu.iblogger.org/36726598189.pdfIn PDF document text
    • https://cdn.sqhk.co/luginuwi/eQhws9p/heart_rate_monitor_app_free.pdfIn PDF document text
    • http://laluwufakiwo.iblogger.org/high_digestive_tract_bleeding.pdfIn PDF document text
    • https://cdn.sqhk.co/sebazisop/ifjghsM/19996113392.pdfIn PDF document text
    • http://xejikunibe.22web.org/atomic_structure_class_8.pdfIn PDF document text
    • https://cdn.sqhk.co/xajamenujo/wOjbjfS/99500889264.pdfIn PDF document text
    • http://ranixora.iblogger.org/46637813550.pdfIn PDF document text
    • https://cdn.sqhk.co/wedowetaso/6dhhiiF/vadilemiw.pdfIn PDF document text
    • https://cdn.sqhk.co/disonixures/hh3xGjb/black_screen_images_hd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f3ea461b-95fd-44cf-949c-5afda193840f.filesusr.com/ugd/a48928_7d4a2bd13d3141cca1a32e4d9c630e34.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3933566e-847b-47e5-bfea-6e6b946305ad/how_to_find_the_area_of_a_triangle_using_sine_rule.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa2a6830-ea49-41f0-ac05-cf8e658d9487/37504154907.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38a5d47c-19f5-4973-a63b-8750f0f0f7c6/critical_review_of_a_journal_article_format.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b554b3f4-d0e4-4dd4-afd1-a58c35fe835b/redojugitelibok.pdfIn PDF document text
    • https://a22c3535-4c29-4f26-bf6b-1e631d3648e5.filesusr.com/ugd/28986c_c399871f3fcc4597a1393c0b6dbcea7c.pdf?index=trueIn PDF document text
    • https://c93ae04b-3d95-4128-ac62-0503c91a26e1.filesusr.com/ugd/002f5e_07ec5c6376624b14ba1477c0e09ba3f9.pdf?index=trueIn PDF document text
    • http://porapasegunan.epizy.com/report_illegal_dumping_canberra.pdfIn PDF document text
    • http://gekabogaramal.rf.gd/navoreduxigug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0c55983-8e19-4496-b953-a87a1520b35f/how_to_write_a_descriptive_poem_ks2.pdfIn PDF document text
    • http://rejiluset.epizy.com/wumoxutasekenabubod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/067aa60c-c8f3-4ad5-b321-03c0f92c6a4a/7_day_eat_clean_challenge.pdfIn PDF document text
    • https://891dfe3a-8969-4df2-b253-5ccc4ebbb7a0.filesusr.com/ugd/e66789_019772ed550d439899925ff3e82f684a.pdf?index=trueIn PDF document text
    • https://d926c97b-7f3b-4ec8-a52a-318bcb589338.filesusr.com/ugd/120f26_caea4acddda643208acd1dacee5e9850.pdf?index=trueIn PDF document text
    • http://rumakepalo.rf.gd/wuxinebezul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9102b153-ee5d-4a93-a783-c3eee8f06ad6/can_you_export_google_slides_to_keynote.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_off0000f75c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75C 5508 bytes
SHA-256: e94cc3126e7eab2b2d5810988c5db267d3c7c1f83dddfb99eee050389832f408
font_01_sfnt_off00010a0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0A 10400 bytes
SHA-256: 91947dc48671576470146fc8f496d6afa1627e32aeb7851fa299a4166a9104b5