Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4db74266209b04d…

MALICIOUS

PDF

77.1 KB Created: 2021-03-29 10:15:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: fa0772abab21d34309dd050c2ce93d44 SHA-1: 8030d1e7abce7448b9ce519700b5700eee7c02c1 SHA-256: e4db74266209b04d0573dca56623b6c04911cbe04426b976917053795609aff3
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains keywords related to product comparison, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://xajibur.ru/strik?utm_term=which+toaster+brand+is+best PDF link annotation
    • https://nererudufujodu.weebly.com/uploads/1/3/4/3/134321338/pakisavigege_poletigeleru_woxaxeko_zikiwuke.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468289/normal_5fe3fd80de3f0.pdfIn PDF document text
    • https://muxojuwarerufi.weebly.com/uploads/1/3/5/3/135388895/zowurofiximajin_zononetu_pumanikimuzira.pdfIn PDF document text
    • https://fadapezak.weebly.com/uploads/1/3/0/7/130775088/5f6d39.pdfIn PDF document text
    • https://paludiwebi.weebly.com/uploads/1/3/4/0/134012690/2299770.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459791/normal_6033a2220fa10.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448549/normal_5fed9662e7d95.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368479/normal_6057f8b3096cc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488842/normal_5feb1b0b00b50.pdfIn PDF document text
    • https://mupasifuv.weebly.com/uploads/1/3/2/6/132680827/d26710.pdfIn PDF document text
    • https://gaduforijap.weebly.com/uploads/1/3/1/3/131381464/safoten.pdfIn PDF document text
    • https://nalokulomegeze.weebly.com/uploads/1/3/4/7/134758193/8113263.pdfIn PDF document text
    • https://vawosikajoj.weebly.com/uploads/1/3/1/4/131438279/koxunuf-sidudinoposile.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387929/normal_5fec895259913.pdfIn PDF document text
    • https://fuzimisadu.weebly.com/uploads/1/3/5/3/135319831/92c36a33123f10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469359/normal_602c918c40447.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5634f520-c25d-421d-ab67-3d94505d13cb.filesusr.com/ugd/1b85ab_366dfe43caf64ee7ab36d3f583534c41.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3dd4010b-5df3-4c10-bec1-b10adf48c00d/bigger_leaner_stronger_eating_plan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95766203-b22b-455f-a95b-34606207c45f/15503091339.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c8225e4-4eee-425f-9182-0b72084871d1/87734781847.pdfIn PDF document text
    • https://4bc473c2-84d0-4913-8b4e-281bf44fba2e.filesusr.com/ugd/a25dbd_b3aa6e53fbf94f78bd48e26498e196a2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/928678ef-0a4c-41a5-849a-dc6681ed2ed4/meade_497_autostar_hand_controller.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/397e5fe9-f34d-436c-ade1-46537cb9947a/what_order_should_i_watch_twilight.pdfIn PDF document text
    • https://3fb740b9-71d8-4183-8edb-de11b68c0a29.filesusr.com/ugd/1fbf8b_56a4721ee5e24f46a3354c13513c4a7a.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6B 5148 bytes
SHA-256: 9d7ad701a83b1e78f5c199b11c168b24a2dcb6094c507659f7874668d533d850
font_01_sfnt_off000100f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F1 10748 bytes
SHA-256: 07229757ff3afd1b37771abc5d1cef89c1473875f51c0bf964f9fb78f989be6b