Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb4ecb136dc9ef0e…

MALICIOUS

PDF

78.2 KB Created: 2021-06-07 20:32:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 11442c58d559212311d4f5c409cb3ed4 SHA-1: 338ae465ff96b684cfc31488948f0fdd293c4c67 SHA-256: bb4ecb136dc9ef0e1d4acf54b55363329dff8858ffbcaf0ee5b3fbf7821b8a12
186 Risk Score

Malware Insights

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

This PDF file contains a significant number of external links, identified as a link farm. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a deliberate attempt to create a large number of links, potentially for SEO manipulation or to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, with the primary goal appearing to be directing users to external, potentially harmful, content.

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
  • 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://irlanc.ru/pbw?utm_term=most+cool+city+names PDF link annotation
    • https://xonasuxodu.weebly.com/uploads/1/3/2/6/132681295/361518e379.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366343/normal_600ac792c072c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464722/normal_60037b5223757.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485309/normal_601b4a4cd13ce.pdfIn PDF document text
    • https://momexifolel.weebly.com/uploads/1/3/4/3/134319719/xiwafebinon-zibosebekan-menik-gixofo.pdfIn PDF document text
    • https://pikofejuja.weebly.com/uploads/1/3/4/4/134478885/7bdb0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373769/normal_601bc85039c46.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420924/normal_5fcee73d5b269.pdfIn PDF document text
    • https://napufifibadabe.weebly.com/uploads/1/3/1/4/131406817/vuduru-kivenovunav-rorigisugo-fovulevotekepob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423443/normal_60610e0771039.pdfIn PDF document text
    • https://pudupisegatijuw.weebly.com/uploads/1/3/4/6/134670509/b2cd9b9b8fd7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401697/normal_60431078704e2.pdfIn PDF document text
    • https://nojokubovurob.weebly.com/uploads/1/3/1/6/131606526/bezepodux_vutedujukud_piriwofike_kidariri.pdfIn PDF document text
    • https://sopazavevorud.weebly.com/uploads/1/3/4/3/134370644/xebupababilew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485173/normal_60308f861d5b4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/373e48fb-de89-45e0-a289-4c7b525f347f/casio_g-shock_mudman_solar_powered_atomic_watch_gw9000a-1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99bf1098-7809-466b-9e5a-ab051acab1e6/what_does_bnf_mean_in_banking.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69b82d5a-3316-4a64-bdb2-317adb69f735/bebasele.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb38aa1d-e5f2-43ed-adfb-912c327568f1/zudanamiwiziladisowa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/152c345d-e091-4bed-946a-8d7288f43cd2/jugolosigexaga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61da8942-20db-4170-a23b-69d900a89507/how_to_make_a_beta_symbol_in_word.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c77db0cf-5a39-4f40-8bb8-71c1c9dcfe5d/23666194532.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_off0000f470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF470 4956 bytes
SHA-256: 45ca7eabb6c96680263c4c57caf807e67e5562fc9ef90498360aa29a05208f9f
font_01_sfnt_off00010555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10555 11264 bytes
SHA-256: 05d7b44feebf8aff7348838b2ae82c29a8dd7dd37942f8cf4e8e79ae814a7114