Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e6154055cfd178c…

MALICIOUS

PDF

73.9 KB Created: 2021-05-12 03:57:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ff1c4e21fbe18a958d45b9a013c46198 SHA-1: 21054ebe9545f8c98fccb1a36992d18381ec0c07 SHA-256: 6e6154055cfd178cb8170b8df6dda8c6d9a950781932102c76ed5bc95bf34fd2
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a large number of external links, with one prominent URL being https://jottigo.ru/strik?utm_term=lola+and+the+boy+next+door+book. This suggests the document is designed as a link farm to redirect users to potentially harmful sites, aligning with phishing or malware distribution tactics. No scripts were extracted, but the extensive link farm points to a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://jottigo.ru/strik?utm_term=lola+and+the+boy+next+door+book PDF link annotation
    • https://dujililapute.weebly.com/uploads/1/3/5/3/135347223/7587016.pdfIn PDF document text
    • https://niforobufuxir.weebly.com/uploads/1/3/4/5/134512868/mefojupujebapa.pdfIn PDF document text
    • https://rogupogadagome.weebly.com/uploads/1/3/1/3/131398605/158c3f46edc5.pdfIn PDF document text
    • http://tufodudem.mypressonline.com/the_nuts_and_bolts_of_cardiac_resynchronization_therapy.pdfIn PDF document text
    • https://cdn.sqhk.co/zimopaji/hchigWa/picsart_photo_studio_photo_editor_windows_10.pdfIn PDF document text
    • https://lufosafol.weebly.com/uploads/1/3/0/7/130775677/4820731.pdfIn PDF document text
    • http://legibovusapezo.mypressonline.com/bakisupoxebemipetiximaxo.pdfIn PDF document text
    • https://cdn.sqhk.co/nepozenilu/hickgib/tinalajakukelo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d5f1d3db-1598-48d0-a061-764c190a6564.filesusr.com/ugd/866690_e83cd6b648da4cba88047dd415b067f6.pdf?index=trueIn PDF document text
    • https://46ebecaa-9490-439b-bba6-ee77f1a6ca93.filesusr.com/ugd/cee8a1_44bc5cb5e4db415db1486c093d7ed343.pdf?index=trueIn PDF document text
    • https://0df6220b-9630-4647-aab6-0d9db69b9d59.filesusr.com/ugd/8b97dd_31f7c4558ac34382a4cfa897fac8940a.pdf?index=trueIn PDF document text
    • https://30383b9b-b26a-44f4-9a26-03873af8f03c.filesusr.com/ugd/fdee49_51b44561eb6f41c38a1a6dd7b9915de9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/221cf181-f5a9-4c7a-b1a7-0d4a3a10cf94/75977450060.pdfIn PDF document text
    • https://b1706aec-e9b1-4c6c-9a93-f14ef4a1c402.filesusr.com/ugd/3b47cb_5202a9346e7445e1b050a5ad77dae310.pdf?index=trueIn PDF document text
    • https://1f2f8e77-98df-4c5e-b88a-83bc2b612b58.filesusr.com/ugd/5c7528_3f2906b2cd804c51bb9c1d7cb3af5abb.pdf?index=trueIn PDF document text
    • https://e114ad41-1367-46fe-a5fd-427bf640f69d.filesusr.com/ugd/a63c55_0e6c8b96e2f740fc9e227147e99ea9dc.pdf?index=trueIn PDF document text
    • https://160e4e15-e27a-4ef2-9b26-f67fc0969a86.filesusr.com/ugd/cbdbb6_1740c6c0a06f4362b332985b7fe07c21.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/46f4a5e5-df7f-4615-8231-40b53caceca8/xuniripoxezowetozuwemesu.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_off0000e44f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44F 5048 bytes
SHA-256: cfb0746083835248a1be3b89ef9780fa98875908a100f1fbe46398c7127dad17
font_01_sfnt_off0000f57b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57B 10872 bytes
SHA-256: bec714a7f47f42ca7a112d42526e4689e7c9c6eba94131ce973f917d8971dd83