Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ab58d3a06056f71…

MALICIOUS

PDF

124.2 KB Created: 2021-06-02 04:50:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e5528facecd8727d653c4750d5f31dcc SHA-1: df294437ac1e04708b47441bfb61b5fae5fa60ef SHA-256: 5ab58d3a06056f7112a0c66ce302d27e7553b540ad773cb4dc6f74eece951600
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, suggesting a link farm designed to drive traffic to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards an attempt to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://garglob.ru/pbw?utm_term=writing+task+2+topics+ielts+fever PDF link annotation
    • https://rigugoxa.weebly.com/uploads/1/3/0/7/130776225/59e4d44e208fc89.pdfIn PDF document text
    • https://loxufezikuwudi.weebly.com/uploads/1/3/4/6/134687227/0e8e5.pdfIn PDF document text
    • https://puwubebuserow.weebly.com/uploads/1/3/4/4/134403982/d67ab2574ed9c3.pdfIn PDF document text
    • https://wukavuzadit.weebly.com/uploads/1/3/0/7/130776823/perimopunadive_pimup_vavixur_nepozuwofukop.pdfIn PDF document text
    • https://mirafovunezozur.weebly.com/uploads/1/3/4/3/134339146/tunof.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4476938/normal_60b49e4f65bbc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378171/normal_5fd61f3d94816.pdfIn PDF document text
    • https://nupebovewurezo.weebly.com/uploads/1/3/2/7/132710783/5525172.pdfIn PDF document text
    • https://xefomivor.weebly.com/uploads/1/3/0/8/130814633/mamigixo-fojapolumuxo-voduvusoxipu.pdfIn PDF document text
    • https://rijemozedez.weebly.com/uploads/1/3/1/4/131407135/felila_lelunilegil.pdfIn PDF document text
    • https://sinixamaruxibul.weebly.com/uploads/1/3/4/6/134653816/lajowetetoragow_gevikuduf.pdfIn PDF document text
    • https://jozudepixivi.weebly.com/uploads/1/3/4/6/134682498/52e810ca.pdfIn PDF document text
    • https://pezobarifad.weebly.com/uploads/1/3/5/3/135394950/sibiviwalelove.pdfIn PDF document text
    • https://gajaxaja.weebly.com/uploads/1/3/2/7/132712369/jasebuwo.pdfIn PDF document text
    • https://vobogokofudukig.weebly.com/uploads/1/3/0/7/130775751/5262654.pdfIn PDF document text
    • https://befufagu.weebly.com/uploads/1/3/1/3/131384284/zabafomunonej.pdfIn PDF document text
    • https://nikakakuko.weebly.com/uploads/1/3/1/8/131871571/818145.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499329/normal_5fde9de02a02d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458413/normal_6049cdb0aa9b2.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://uploads.strikinglycdn.com/files/8e66c2e9-d940-46a7-9227-512f7b37ed1b/dewurutes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a27a1e08-74f2-4aa3-a455-16231fab17ed/xibulologifenimuvu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5474fb6-042c-4a83-878d-265a53f5eaa7/what_size_is_1_inch_in_cm.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019bc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19BC6 5240 bytes
SHA-256: 6750080d99321a4e346280878b4c271bb0a9e29b2c4f02020276fd1567d908b0
font_01_sfnt_off0001adb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ADB8 11544 bytes
SHA-256: 19e72fa1fa0ab21d0b3ac9af8037ac27126e2da4de0bda4b6a4df2b87f1adf6c
font_02_sfnt_off0001d4c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D4C2 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3