Malicious PDF — malware analysis report

Static analysis result for SHA-256 845d8e80f56287a4…

MALICIOUS

PDF

75.1 KB Created: 2021-03-06 22:34:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 941651e7efcb0e59daa345b1fdd1a5a3 SHA-1: 674039f66aca4b77c9f21941d139f93005853f22 SHA-256: 845d8e80f56287a404a5421e3829430f053d6618a242ccab618436dc6c552ad0
244 Risk Score

Malware Insights

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

This PDF document is identified as malicious by multiple heuristics and a machine learning classifier, indicating a phishing or redirection attempt. It contains a large number of embedded links, many pointing to disposable domains, suggesting it's part of a link farm designed to distribute further malicious content or phish users. The document body, though heavily obfuscated, appears to be a lure related to driving tests, which is then used to mask the true malicious intent of redirecting users to a network of potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://crophysi.ru/award?keyword=how+to+pass+the+written+driving+test+in+tennessee In PDF document text
    • https://cdn.sqhk.co/nuduniguwufo/cibthg0/birdy_skinny_love_sheet_music.pdfIn PDF document text
    • http://nesegejisivinu.medianewsonline.com/sunbeam_mixmaster_heritage_series_bowls.pdfIn PDF document text
    • http://helplnstagramcontact6088756.com/is_there_another_series_after_the_heroes_of_olympusnijx5.pdfIn PDF document text
    • https://cdn.sqhk.co/sifajoxojif/bzgeVb3/pathogen_science_meaning.pdfIn PDF document text
    • https://cdn.sqhk.co/dugabolisuma/jjjhgfn/27560198554.pdfIn PDF document text
    • https://pulogumofus.weebly.com/uploads/1/3/0/7/130739416/venoliwepitu.pdfIn PDF document text
    • https://tabawowap.weebly.com/uploads/1/3/4/5/134599755/1747352.pdfIn PDF document text
    • https://cdn.sqhk.co/bupitagalir/5zgeggD/xaxaj.pdfIn PDF document text
    • https://cdn.sqhk.co/pixazizaze/iBGgi2k/cookingshooking_chocolate_cake_video.pdfIn PDF document text
    • http://wisatemubudu.medianewsonline.com/xisamexikotivawimipil.pdfIn PDF document text
    • https://cdn.sqhk.co/sovanoniwuva/hhjjggp/calcular_el_iva_en_venezuela.pdfIn PDF document text
    • https://cdn.sqhk.co/rubovadu/iTjefF5/bellator_mma_vs_ufc.pdfIn PDF document text
    • http://blognews.top/45154307140px4u2.pdfIn PDF document text
    • http://winclean-shop.space/supplemental_security_income_amountf81nu.pdfIn PDF document text
    • http://usmileofficial.site/naturalizer_boots_amazon2t6p4.pdfIn PDF document text
    • https://cdn.sqhk.co/dukosisevu/ighivkr/15510198330.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kenesowozowojaw.myartsonline.com/17992474024.pdfIn PDF document text
    • https://fccd5518-64e1-462d-9dbe-8d8d8a19ca7a.filesusr.com/ugd/eb005d_e5ac1858e35c427183f03ea76a7b99f4.pdf?index=trueIn PDF document text
    • https://90ff81fc-98d9-4e53-96a3-aaa5c1c2042e.filesusr.com/ugd/bb5aff_27ae1f9d1fcf4a56b83862ff0dc04de3.pdf?index=trueIn PDF document text
    • http://vorisenunajix.myartsonline.com/34884328159.pdfIn PDF document text
    • https://770cee9b-59ea-4c2b-ae8d-aad83b0abb79.filesusr.com/ugd/8b25c7_bc532905f9a4485fa4e5d3b284539c4c.pdf?index=trueIn PDF document text
    • https://47e244ab-6b1f-4ae7-97e8-86de5b619f9f.filesusr.com/ugd/e1d12c_b8005b17dad749b1b4a2b09fb274e291.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B1 5300 bytes
SHA-256: 4e29cfacca5f2ceeb9943b9ab0c33833fdad99dc06cd9121598ae84966a9f071
font_01_sfnt_off0000facb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACB 10560 bytes
SHA-256: 11c7ab0ea9f0cb7712296b48ce76789bfcae86712bcdf4352f2518eb03695e77

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