Malicious PDF — malware analysis report

Static analysis result for SHA-256 28409d72aa99a537…

MALICIOUS

PDF

109.1 KB Created: 2021-05-28 16:42:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: afe9cb807311dafbb1cf06c82f7ddbf9 SHA-1: de3793239b42cfbab42e2b01986bacf932f789a9 SHA-256: 28409d72aa99a537e9e14a5c4e517d95f81ce2e67cf6864f426b14bfcf323743
126 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on disposable domains, suggesting a link farm or phishing attempt. The primary URL, 'https://lozipotod.ru/strik?utm_term=how+to+get+microsoft+word+starter+2010+for+free', indicates a lure for free software. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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 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/strik?utm_term=how+to+get+microsoft+word+starter+2010+for+free PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4428331/normal_5ff48a98e51b6.pdfIn PDF document text
    • https://fipijoxat.weebly.com/uploads/1/3/4/8/134888739/vasepejavoro.pdfIn PDF document text
    • https://pawomasa.weebly.com/uploads/1/3/4/7/134737305/gezumez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379612/normal_6069746af3aa3.pdfIn PDF document text
    • https://bupulaserora.weebly.com/uploads/1/3/1/4/131437689/zaxotedipusun_tevadeli_xebejukamiro_vunugomaditen.pdfIn PDF document text
    • https://momogomuwe.weebly.com/uploads/1/3/4/8/134885938/negexagibufuzonizuno.pdfIn PDF document text
    • https://radoxawema.weebly.com/uploads/1/3/0/7/130738714/6270614.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374852/normal_5fd042bd55d7f.pdfIn PDF document text
    • https://ramaxudefe.weebly.com/uploads/1/3/4/0/134042793/bavotimapevewiza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366375/normal_601f04031da70.pdfIn PDF document text
    • https://jebasiju.weebly.com/uploads/1/3/1/3/131381450/raxusufuvevir.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481417/normal_5fcb9dda5d922.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374983/normal_6005b5e1d2943.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468819/normal_602ab39558d06.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/b8d8b760-98a5-44fa-a96d-36566c0c828c/7647733769.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f71fe634-2e01-4da7-89ab-ec85e6d8e6eb/22841546375.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/468c863f-3e0d-4820-80c6-37838b671022/como_hacer_fotografia_digital_tipo_credencial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1556c95-2ccb-4652-9ead-6b831e1f3888/proficy_machine_edition_7.0_download.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000134ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134BA 9652 bytes
SHA-256: 26df854c62c8131353f84ab6b42729b0120dc340dc64f958004b78466a45a42b
font_01_sfnt_off00014efb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EFB 5688 bytes
SHA-256: 1252604043688c312351c854e72c00160d9f77c7235b2293b3639516847892a3
font_02_sfnt_off0001625d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1625D 13652 bytes
SHA-256: 4fb3ddaa966ad22a84b2d7d7f9d3e86a8399cf045bf9782db6f5f160af32bb07
font_03_sfnt_off00018ecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18ECD 16300 bytes
SHA-256: f3ecb0af73e86628d90f0cbc02b1a848873b327c213c1f7c41508395a65b13dd