Malicious PDF — malware analysis report

Static analysis result for SHA-256 8186a7b5dbdfd775…

MALICIOUS

PDF

75.2 KB Created: 2021-05-29 08:23:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 26379b7e1b818a1a2c0ad5aed3f1bc1e SHA-1: d0ef969036f565cf81de3dfb3eab397b02c71dfe SHA-256: 8186a7b5dbdfd77501dec34f29100d2c81cfe188c5459ad6e7f80f43d870f555
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards techniques used for SEO manipulation or directing users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://gimoguvi.ru/123?utm_term=epfl+new+logo PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4466135/normal_600f61b5a14b8.pdfIn PDF document text
    • https://tobiwetizipuwon.weebly.com/uploads/1/3/5/3/135341648/0b4633.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387033/normal_603b5ab0cdc4d.pdfIn PDF document text
    • https://bebiluredop.weebly.com/uploads/1/3/3/9/133987060/695277.pdfIn PDF document text
    • https://wutupebepa.weebly.com/uploads/1/3/3/9/133997315/jesirul_fofexukew_juxavoroxun_sipiwenupunix.pdfIn PDF document text
    • https://bigonukoduxa.weebly.com/uploads/1/3/2/7/132741189/xumebagomenobes.pdfIn PDF document text
    • https://rajawanog.weebly.com/uploads/1/3/5/3/135320481/wunanefoziduxemuron.pdfIn PDF document text
    • https://ferosikapomizud.weebly.com/uploads/1/3/4/5/134526037/834806973f8.pdfIn PDF document text
    • https://gepekipaw.weebly.com/uploads/1/3/5/3/135304147/revadolerasagekozosu.pdfIn PDF document text
    • https://vewifofuk.weebly.com/uploads/1/3/5/3/135394013/pijizeberopetetavape.pdfIn PDF document text
    • https://namuxewanazojo.weebly.com/uploads/1/3/4/2/134266474/9194537.pdfIn PDF document text
    • https://gokejaxax.weebly.com/uploads/1/3/6/0/136056436/kosugakisus-gupememuwimif-dugopoxaxivag.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/c279d1fe-4c56-436d-acb0-5b65dab13715/the_ones_who_walk_away_from_omelas_symbolism_of_the_child.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2488dc6a-1524-46db-bc06-90c6b7e839f2/24985344711.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9959681-9abc-40d0-beee-86501be357e0/zozelepudetakawebofat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f9bf615-a3a0-4415-9097-c71f5db59260/91611699751.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ad8ab51-2c98-439b-a488-71c1f85d04dc/yo_amo_a_paquita_gallego_capitulo_104.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffd5634b-c8b9-4578-841b-6960c6894846/kitchenaid_stand_mixer_black_friday_amazon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f16e4053-63d1-42b0-b62d-ee95f0415448/wusupovepujoxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60ca47a2-81fb-4724-9d81-4a13155be95c/premier_protein_chocolate_powder_recipes.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_off0000ebe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE9 4632 bytes
SHA-256: d1a08819cfa436c5b4379976d21e5f7e7aa40bfca0771b6eba3c36d7ef8c4650
font_01_sfnt_off0000fbe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE6 10572 bytes
SHA-256: 6f816ccf91e9a9c6db1073135b2ec3b1fffe1925b1715563b1f7f0f3caaf130d