Malicious PDF — malware analysis report

Static analysis result for SHA-256 92d1e651c17ce9f9…

MALICIOUS

PDF

95.5 KB Created: 2021-05-10 22:59:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: ee2273c94d06c062c9295dd193cc133a SHA-1: 253345943559db1ef7a771b001e99f3667053fe4 SHA-256: 92d1e651c17ce9f94b018b3c30905a94b7c39bdc0f03833894503a516c08a6e4
244 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable domains and redirector infrastructure, indicating a link farm designed to obscure malicious destinations. Heuristics indicate it's a malicious redirector and a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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/strik?utm_term=english+nursery+rhymes+lyrics+pdf In PDF document text
    • http://goods-amzon.com/how_to_run_a_business_for_dummies_bookl1ytq.pdfIn PDF document text
    • http://rentline.pro/98022939340mobtj.pdfIn PDF document text
    • http://peteferix.mypressonline.com/xuvodivirisozelologati.pdfIn PDF document text
    • http://copytoshka.ru/recarga_nauta_wifi_en_cuba167j1.pdfIn PDF document text
    • http://stnold.com/how_to_make_viridian_green_acrylic_paint0oblk.pdfIn PDF document text
    • http://tufodudem.mypressonline.com/gosadavelafew.pdfIn PDF document text
    • http://tufofol.medianewsonline.com/pirudanusuwiradunikej.pdfIn PDF document text
    • http://lasns.fun/jebuzulubivafikadawibamll7c.pdfIn PDF document text
    • http://reduslimitalia-official.website/dogemomisarez6gve3.pdfIn PDF document text
    • http://hhizmet.com/merunawimucjpuz.pdfIn PDF document text
    • http://sabovibin.medianewsonline.com/epinephrine_auto_injector_davis.pdfIn PDF document text
    • http://juwaniwabi.medianewsonline.com/jspdf_autotable_column_styles.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://67536400-2f23-40e2-9d3a-36ae3f4dfb8c.filesusr.com/ugd/5312ea_cb64baeb3ba244fabac35bece3c974e9.pdf?index=trueIn PDF document text
    • https://2ffa788b-df2f-461f-b9c5-573bec542745.filesusr.com/ugd/374ce0_5762162f84464e1e88c215c82197d450.pdf?index=trueIn PDF document text
    • https://507f79ed-2408-4027-b124-45ed49bded7d.filesusr.com/ugd/2de61b_2efb32c5a49641e2b29cf38f8b660fe0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nunakixuma/72590846606.pdfIn PDF document text
    • https://0eb00d84-361a-45dc-b346-1af5c8eb785c.filesusr.com/ugd/d79848_03d4ca76f42a4dd69c703639f4dfa256.pdf?index=trueIn PDF document text
    • https://7b4e975e-109f-4397-a679-93e438ff1453.filesusr.com/ugd/c33f71_6cd5b44f3b7340908527056d415f9e0e.pdf?index=trueIn PDF document text
    • https://7a1f2a0d-094a-4466-88af-72a4af93b9fa.filesusr.com/ugd/22739b_f26b0381e8d14647bc1ac6d69e112749.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fadupazageraf/domupebedogapit.pdfIn PDF document text
    • https://e1318bff-d970-45e2-bcea-45481503a18b.filesusr.com/ugd/75a96d_64632d77762b4974b61e0b0e44d5044a.pdf?index=trueIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11385 7948 bytes
SHA-256: 5a18961cba4479a92f7e26760a9264c1b7cdc80c152e70cbd16207ebd16717ae
font_01_sfnt_off00012dba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DBA 5416 bytes
SHA-256: ba6f6bd955f6771c020ff56d9987a7ef6186d4a710c20b9b0b500dd93a2e0faa
font_02_sfnt_off0001400c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1400C 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_03_sfnt_off0001489a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1489A 11488 bytes
SHA-256: e4a8a92a2d0270a619b895040c888de12cc1cc144424d1d0b28c55d9a3c01150

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