Malicious PDF — malware analysis report

Static analysis result for SHA-256 210861f4e964c193…

MALICIOUS

PDF

114.5 KB Created: 2021-04-01 13:17:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 3f6c64b345c0fe9d81547f14690a01e1 SHA-1: ee3e930bfc50d7083c655d73b2f06132546917b4 SHA-256: 210861f4e964c19389c3f50108bd61c69fa35e858c75efc823340a3816f5e387
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to 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 URLs are indicative of a phishing or SEO spam campaign designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://pelibifir.ru/strik?utm_term=what+is+difference+between+liberalism+and+realism PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4427313/normal_600a18653fcd3.pdfIn PDF document text
    • http://shtangennstutkupitseychas.xyz/75827376871s58sw.pdfIn PDF document text
    • https://sojozukajarab.weebly.com/uploads/1/3/4/2/134265810/9ff9336d660381.pdfIn PDF document text
    • http://qrastenmap.online/focal_peripheral_neuropathies_stewart8dxdi.pdfIn PDF document text
    • https://fuzipoxo.weebly.com/uploads/1/3/0/8/130873840/1281795.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388037/normal_602f001dd6af4.pdfIn PDF document text
    • http://musc-media.xyz/how_to_blur_something_in_paint.netku8xa.pdfIn PDF document text
    • http://tiktokhd.design/sejenilerkx4gj.pdfIn PDF document text
    • http://reduslim-shop.site/13500749115w3cib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420028/normal_602bddfd2eedd.pdfIn PDF document text
    • http://keepxufi.space/44021452257f19sr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377109/normal_60334227ba418.pdfIn PDF document text
    • https://goneduxif.weebly.com/uploads/1/3/0/9/130969586/8343129.pdfIn PDF document text
    • http://hookup154.space/rox_q-1_bilgisayarda_org_alma_program_indir8el67.pdfIn PDF document text
    • http://swast-group.website/viva_bingo_slots_free_casinou3rq2.pdfIn PDF document text
    • http://igcopyrightverify.com/fuxibagivabo5mdvs.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490735/normal_5fe54362e1658.pdfIn PDF document text
    • https://teleroxekafi.weebly.com/uploads/1/3/5/3/135321942/1761426.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://627ea4a7-3f28-4bf3-8c99-6a9da7dacf48.filesusr.com/ugd/1970e2_b841c06cb0b64b24a1101f9e943e952f.pdf?index=trueIn PDF document text
    • https://48bf584d-d56c-45cf-b4f3-c1c05dce5274.filesusr.com/ugd/3f4b99_608b0ebc375e493480e8599fd677b7aa.pdf?index=trueIn PDF document text
    • https://023e3b0e-89aa-4e00-bd19-175c11a0a9c0.filesusr.com/ugd/5f4883_f4f63735732a41c88639386be886f259.pdf?index=trueIn PDF document text
    • https://bb491b24-4c81-4ccc-8daa-bf1baeb171c2.filesusr.com/ugd/93c935_480ff0673a034a048bcfa70013b2fd44.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17581 5184 bytes
SHA-256: 609ed50b1f9081110cf91fa529b31901218bcbbcaf48defc99026e81752ace31
font_01_sfnt_off000186fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x186FD 11776 bytes
SHA-256: 56deb7727a97d88a6c0da424b4ce5f9f7d95532f56a5404dede0fc84d6ec3308
font_02_sfnt_off0001ae4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AE4A 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71