Malicious PDF — malware analysis report

Static analysis result for SHA-256 7581f45170f1d9a5…

MALICIOUS

PDF

95.6 KB Created: 2021-03-06 10:51:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 7a86e38bade13c5c2717f17f82267cd6 SHA-1: 2a9707706a5a2608415971117cb319ba766c9228 SHA-256: 7581f45170f1d9a5ff2e4e1420f7d481540e209785c1e2a9d4ee43e1295b63b8
244 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to disposable hosting services, indicating a link farm designed to redirect users to malicious infrastructure. The heuristic firings and ClamAV detection confirm its malicious nature, likely as a phishing or redirection tool. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://yafferge.ru/award?keyword=harry+potter+goblet+of+fire+cast+and+crew In PDF document text
    • https://fawukudaboguris.weebly.com/uploads/1/3/4/3/134353338/wovivuza_rulexip_muvumirerebogu_lekevep.pdfIn PDF document text
    • https://cdn.sqhk.co/veletafi/jhiggjb/cute_aesthetic_backgrounds_for_laptop.pdfIn PDF document text
    • https://fexasesari.weebly.com/uploads/1/3/1/0/131070539/zewetitogixad.pdfIn PDF document text
    • http://bewilotaweje.mywebcommunity.org/soccer_drills_with_cones_videos.pdfIn PDF document text
    • https://wewiruvikaju.weebly.com/uploads/1/3/0/7/130775929/vubuwu.pdfIn PDF document text
    • https://nudezodubazez.weebly.com/uploads/1/3/1/1/131164524/8443985.pdfIn PDF document text
    • https://fuwamelewupo.weebly.com/uploads/1/3/4/1/134131589/lopav_varodefa_kukaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393036/normal_602100e2d4338.pdfIn PDF document text
    • https://cdn.sqhk.co/gogerazina/J2hkFgc/61926450362.pdfIn PDF document text
    • https://bupitubijas.weebly.com/uploads/1/3/4/0/134040922/7814602.pdfIn PDF document text
    • https://tonituligavu.weebly.com/uploads/1/3/4/8/134884188/7398531.pdfIn PDF document text
    • https://cdn.sqhk.co/litigoruf/jbjujfW/city_smasher_download.pdfIn PDF document text
    • https://bojibelatos.weebly.com/uploads/1/3/4/0/134040608/9f50ff61fe8d866.pdfIn PDF document text
    • https://vevorusafe.weebly.com/uploads/1/3/4/5/134516648/4864497.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477892/normal_6025a8196921c.pdfIn PDF document text
    • https://cdn.sqhk.co/nubalevuvem/ahed91v/us_air_force_military_ranks_in_order.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447888/normal_6030848d9d9cd.pdfIn PDF document text
    • https://pojixaguwor.weebly.com/uploads/1/3/1/4/131453565/2264218.pdfIn PDF document text
    • http://vuwefedope.sportsontheweb.net/how_fast_does_a_person_fall_from_100_feet.pdfIn PDF document text
    • http://tusiteguluvora.getenjoyment.net/strongs_concordance_2111.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480174/normal_602b0d1383944.pdfIn PDF document text
    • https://pimusaxasoj.weebly.com/uploads/1/3/1/8/131856122/7d3b88ad.pdfIn PDF document text
    • http://dimozakebaba.scienceontheweb.net/cutting_for_stone_summary_sparknotes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390350/normal_6037026e5ccba.pdfIn PDF document text
    • https://cdn.sqhk.co/tokofape/l5hciff/photo_editor_change_background_color.pdfIn PDF document text
    • https://ranilabat.weebly.com/uploads/1/3/5/9/135999147/busegotefuxujar_xaregetam.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_off000138c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138C1 5620 bytes
SHA-256: 56d767d1a1501eda36c55ee2505d7943a1e8843d2750867442f2faac7158ec9f
font_01_sfnt_off00014c02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C02 10692 bytes
SHA-256: d0eea099a2105829a7c588881299762df9ec84cb255c3b4ca8fb2bb4c7a78a86