Malicious PDF — malware analysis report

Static analysis result for SHA-256 e28c67d689bdab51…

MALICIOUS

PDF

74.1 KB Created: 2021-03-12 09:11:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 5680b40c139d87cb1d242413dedbfe65 SHA-1: db80e52c9776b6024cfb6a43fb09e4caddb5bb9c SHA-256: e28c67d689bdab5156505ef82ea2a5fb4e8dc1b4b24d86aae681f13f2f4753a3
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing/trojan. It contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics suggest this PDF is used to distribute further malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://nipisod.ru/strik?utm_term=the+lord+of+the+rings+series+in+tamil+dubbed PDF link annotation
    • http://bagawixaj.mywebcommunity.org/71581809045.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366376/normal_601270da2ccb2.pdfIn PDF document text
    • https://cdn.sqhk.co/wejideduv/actOncG/50451071125.pdfIn PDF document text
    • http://pesuloduf.medianewsonline.com/lilelumizezatoxuxarimexul.pdfIn PDF document text
    • http://lejunuzegakikuv.mypressonline.com/how_to_program_a_chamberlain_universal_remote_control.pdfIn PDF document text
    • https://cdn.sqhk.co/buzulexoxuve/cB4hIic/wulotaforup.pdfIn PDF document text
    • https://cdn.sqhk.co/bogovureg/dambxQP/flex_flow_sid.pdfIn PDF document text
    • https://cdn.sqhk.co/zasokolof/ibidigT/sizuniwi.pdfIn PDF document text
    • https://medotufise.weebly.com/uploads/1/3/4/5/134512565/00f4ee27e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408464/normal_5ffc6edf894f6.pdfIn PDF document text
    • https://nifatukipukixe.weebly.com/uploads/1/3/1/3/131398430/2117664.pdfIn PDF document text
    • https://cdn.sqhk.co/puzadowoke/i4PElig/34637668208.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvebopeweb/A8zjgif/whatsapp_images_of_nature.pdfIn PDF document text
    • https://nogusuxewi.weebly.com/uploads/1/3/1/4/131438155/funugutakada.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494435/normal_5ff60761a7922.pdfIn PDF document text
    • https://notaxivarem.weebly.com/uploads/1/3/4/6/134633458/240d38f7afb56b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402940/normal_600deff6666b5.pdfIn PDF document text
    • https://begosibaluta.weebly.com/uploads/1/3/0/7/130775163/vuxamejezani.pdfIn PDF document text
    • https://cdn.sqhk.co/dosazuleg/fJSagja/24hr_plumber_singapore.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://boxijekew.atwebpages.com/eigrp_cheat_sheet.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_off0000e411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE411 5412 bytes
SHA-256: ea8f7f859bc100cc3b879802202948e1b6d4c3931fb551bf26d6d3aebc5e8fe6
font_01_sfnt_off0000f649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF649 10828 bytes
SHA-256: 23c6a902cd2f23b5c5942ac682a653d9b81d32b9efae571b15cc68f454e5eb69