Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b433f1d6fe25d36…

MALICIOUS

PDF

94.1 KB Created: 2021-03-15 10:46:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 8fc5931b3b157a00ca3421024d865ccd SHA-1: b061107c6cfe81e021919cf3ff7676dc86cb22fd SHA-256: 4b433f1d6fe25d368ab73f95308a8dc8502c1cf32e502a1bdfa86a5da91014a4
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, indicating it functions as a link farm. The primary URL, 'https://maypoin.ru/award?keyword=beats+by+dre+brand+guidelines+pdf', suggests a lure to disguise malicious intent. Heuristics indicate this is a link farm on disposable hosting, and ClamAV detected it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/award?keyword=beats+by+dre+brand+guidelines+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379379/normal_602ce81ebcb78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383137/normal_6021556b23186.pdfIn PDF document text
    • https://zetapowopes.weebly.com/uploads/1/3/0/8/130813904/kojoj-weket-womawefa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500429/normal_60417451069d4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381090/normal_5ff161fc5e739.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466386/normal_602dfbd81f712.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393483/normal_5fd81b4c03b6f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451760/normal_5ff340447af5a.pdfIn PDF document text
    • https://vukojudal.weebly.com/uploads/1/3/5/3/135317211/8567218.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457281/normal_6041c86e016e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367952/normal_6033f3fc52420.pdfIn PDF document text
    • https://tugalebuwe.weebly.com/uploads/1/3/4/0/134012885/fasuzaj.pdfIn PDF document text
    • https://nuvitofoje.weebly.com/uploads/1/3/4/6/134640236/23b3a8c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490725/normal_601c8ee8c4011.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/fb803487-8c81-439c-b6c7-e410e6e03855/29044239790.pdfIn PDF document text
    • https://bad3f395-1638-4667-b349-d6f934eeab49.filesusr.com/ugd/ed2d23_1132e084c88146c4a25d3235521fd6ff.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fa1ad96-e952-434b-b80d-e5e17ccaf863/sole_e25_elliptical_size.pdfIn PDF document text
    • https://52ed6390-a5c1-4502-9f93-599cf6d98ad1.filesusr.com/ugd/f7fbc8_1cf74081ba95468f9c3349f67fead9d5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/905ea073-0520-4ccb-b64b-e9ef3609e3e6/80909141238.pdfIn PDF document text
    • https://95a57b4d-a24c-4412-bd87-88f4f885d252.filesusr.com/ugd/011e4b_c14ae365de694e9fb3e798f87da4630f.pdf?index=trueIn PDF document text
    • https://945b3f91-9c76-4178-be32-f0dab3cfe2c6.filesusr.com/ugd/8d5d69_822259416dbd4699ac7843edef53128d.pdf?index=trueIn PDF document text
    • https://69868269-04aa-4a0d-8379-1371762fd556.filesusr.com/ugd/d8beff_ef8400a8386045408f4a22e12abc4a5d.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011c6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C6D 5500 bytes
SHA-256: de47ef1e483d696ba986f6e73e4d0c1a3f9d84e0ea4101982d4d7a866406318f
font_01_sfnt_off00012f34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F34 11392 bytes
SHA-256: b2a7487e5e0eb18c853666be27d6459195d0bb76ed3ce4e38976b3f029799c34
font_02_sfnt_off0001561d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1561D 16060 bytes
SHA-256: 99ddc6f5858eb134f8024171ebe717cbd02485c31471b921a5021903b5272953