Malicious PDF — malware analysis report

Static analysis result for SHA-256 40e7b5f86efe1d66…

MALICIOUS

PDF

70.4 KB Created: 2021-02-19 19:44:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: dd7dae6e7657e2d0ac9b17bf2470caa7 SHA-1: 2237220ae43988cd44cd310efdf0a11935ed820e SHA-256: 40e7b5f86efe1d666f892f361ee78ec9ba9a7066ba147e89974da42a7b113ece
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and utilize SEO-like terms in their paths, indicating a link farm or phishing lure. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a URL pointing to known malicious redirector infrastructure, suggesting the primary goal is to redirect users to harmful sites. The ML classifier and ClamAV detection further support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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 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://yafferge.ru/strik?utm_term=lego+harry+potter+2020+release+date+canada In PDF document text
    • https://cdn.sqhk.co/segenapiza/eTsRahg/70792605736.pdfIn PDF document text
    • http://it50life.pro/mtd_lawn_tractor_deck_belt_adjustmentiigna.pdfIn PDF document text
    • http://cloudplay.xyz/43969707370q9il2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394082/normal_600d32209b69c.pdfIn PDF document text
    • https://cdn.sqhk.co/zulatobi/hSifiid/bupulipugevej.pdfIn PDF document text
    • https://cdn.sqhk.co/xarozowuzosa/0PRjhif/norolixerinixavitu.pdfIn PDF document text
    • http://want-seo.ru/visual_c_2013_redistributable_x86cfwid.pdfIn PDF document text
    • https://cdn.sqhk.co/garisuvonuk/Qhjjf8L/kidcity_hello_neighbor_in_real_life.pdfIn PDF document text
    • https://cdn.sqhk.co/xomifinetepi/gQpvjjK/wexopisifosolazusopanivuv.pdfIn PDF document text
    • http://ulekschool.online/biviwobotiwaxuzokafosotsb5k.pdfIn PDF document text
    • http://momentshop.website/rabaey_digital_integrated_circuits_video_lecturestd8it.pdfIn PDF document text
    • https://cdn.sqhk.co/lafuwexale/bhdwPbs/mobile_ringtone_2020_music.pdfIn PDF document text
    • https://cdn.sqhk.co/pitadewedobu/Djg7zhe/marzipan_pillow_cookies.pdfIn PDF document text
    • http://komarovskii.xyz/4204050839w1azl.pdfIn PDF document text
    • http://regsenatvumen.website/ace_test_series_mechanical3mpyu.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_off0000d409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD409 5652 bytes
SHA-256: c1d091d643abfddd77f58ae0b8545e879e328bab82b613a76e6eadd2d6ea5b3e
font_01_sfnt_off0000e751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE751 10912 bytes
SHA-256: 21cce8cf3255c4f31b981c7d6b3d5262d19cf67e943952f69e1fca4471ee9c7a

Open this report in the interactive analyzer, or submit your own file for analysis.