Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1e78be20c510cd1…

MALICIOUS

PDF

89.1 KB Created: 2021-06-01 08:52:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: f0a9dfc81eb0b3f7990899259cfe0155 SHA-1: 296df157c7d81d3bbf57d51e4b27a6a6758bc8b6 SHA-256: e1e78be20c510cd1471e6a51bcc837ba85b77562533aac54a01d2b1299732337
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://lozipotod.ru/123?utm_term=os+cuneiforme+laterale+bruch PDF link annotation
    • https://wukaxasupureje.weebly.com/uploads/1/3/4/4/134440875/zakajek_xonazubowes_jazubamidalim.pdfIn PDF document text
    • https://sipasegeremiraf.weebly.com/uploads/1/3/4/4/134404187/0c1a757aef64610.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369142/normal_6067c164be73b.pdfIn PDF document text
    • https://jifilebipik.weebly.com/uploads/1/3/4/3/134375607/8b8af5ed.pdfIn PDF document text
    • https://molipose.weebly.com/uploads/1/3/4/6/134644393/9512514.pdfIn PDF document text
    • https://sujumakatu.weebly.com/uploads/1/3/1/3/131379709/mabadofid.pdfIn PDF document text
    • https://neziraninev.weebly.com/uploads/1/3/4/5/134502601/5780872.pdfIn PDF document text
    • https://gevexewu.weebly.com/uploads/1/3/4/0/134018209/ganenuz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370533/normal_605c6cbc0e03f.pdfIn PDF document text
    • https://pirikituda.weebly.com/uploads/1/3/0/8/130874086/655472.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373240/normal_6039d4dde9d34.pdfIn PDF document text
    • https://juwujumatel.weebly.com/uploads/1/3/4/0/134042908/pekuzo_nuwavasupitene_vovesuv_kuxajud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445570/normal_6051b185177cb.pdfIn PDF document text
    • https://fujinimozebuxe.weebly.com/uploads/1/3/0/7/130738673/lawaxuvirori.pdfIn PDF document text
    • https://tajusubinem.weebly.com/uploads/1/3/4/8/134886452/wizodozavisu.pdfIn PDF document text
    • https://lesinagin.weebly.com/uploads/1/3/1/4/131454304/9971465.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/23bca2dc-9773-4d18-9084-b3ace3276b74/dark_angel_vc_andrews_lifetime.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b89ea13-ba3a-4317-80a7-1723f909aded/i_am_malala_book_summary_sparknotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e574cacc-ea71-477d-b1ca-041e2aa97fe7/ziwipujevune.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b756b300-1198-4f4f-bc64-96b9cb25c231/how_to_forgive_more_easily.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c5c731f-83c0-4d29-a0d5-42b82efa1b83/20456251683.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/624d59ce-d99e-4dd1-b854-2dc1762dd0ac/a_fine_fine_school_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf773783-c830-4ae8-8c78-654b21f8da3d/subliminal_psychology_101.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_off00011b3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3C 5288 bytes
SHA-256: da8fc6c87f47f35f2b8465f2a6ca26a902250b4c0e99be39023a7d8456d02c97
font_01_sfnt_off00012d0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D0D 12476 bytes
SHA-256: 751d9bf5db73bdf52097a50a287f3c949072fa3b689d47f4dc2cac19a2445ed7