Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7dc89cd14d9b9c3…

MALICIOUS

PDF

81.1 KB Created: 2021-01-02 00:01:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 0649d7f9954a85d7b381be7b9a47be91 SHA-1: 8c09fc2b7040d0ed14bd277e90837e6242344824 SHA-256: c7dc89cd14d9b9c331a58446cc47ea256e45bcac67138445c3b20fc32adb31cb
226 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, characteristic of a link farm designed to direct users to potentially malicious websites. The presence of a 'Password-protected archive lure' heuristic suggests it's part of a multi-stage attack where the user is prompted to download an archive, likely containing a payload. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://trafffi.ru/wb?keyword=recargar%20diamantes%20free%20fire%20por%20pagostore PDF link annotation
    • https://vunixumo.weebly.com/uploads/1/3/1/4/131453253/25f71d5038.pdfIn PDF document text
    • https://nixixufusolawig.weebly.com/uploads/1/3/4/8/134882604/mujiretela.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383577/normal_5f98745959efc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464852/normal_5fe5de0d3a88d.pdfIn PDF document text
    • https://nokaxogu.weebly.com/uploads/1/3/4/5/134520383/1043470.pdfIn PDF document text
    • https://wibagubid.weebly.com/uploads/1/3/4/3/134373733/bofusoxiwodiwufi.pdfIn PDF document text
    • https://varodapomibaga.weebly.com/uploads/1/3/4/8/134874415/nelasemewuked_jivujosiga_ralopisigodad_zizusijumame.pdfIn PDF document text
    • https://dedolodaramolon.weebly.com/uploads/1/3/1/4/131455072/xuvikipu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418590/normal_5fe39d692c3dc.pdfIn PDF document text
    • https://biwurozijusuxux.weebly.com/uploads/1/3/4/7/134724143/3502e80.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369643/normal_5fa683ad19d0a.pdfIn PDF document text
    • https://rifijilaguselud.weebly.com/uploads/1/3/4/8/134846829/b5e13cd3.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/cbf8b7d2-cc63-4609-babc-f50ee15001c5/31397290139.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f77717df-a64d-4cf2-ae7c-895e05f3cd29/53949869318.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c832f3fe-cb88-4059-b607-d9c286098755/liletefebaliwosani.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_off0000d445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD445 6744 bytes
SHA-256: b29f9350a720d2da9dc50567d08c4a82684db1fcb28a47e3a5788345b392d808
font_01_sfnt_off0000e52a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE52A 5448 bytes
SHA-256: 6b879b79ef6934ba345aaafc85c790ffebf9bee21d5b6a7961950f6de642be95
font_02_sfnt_off0000f7a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A4 12124 bytes
SHA-256: 20ba79bc9e871c7d8f086df878c26edd08dce82cafc4919c206271d207249c48
font_03_sfnt_off00011f74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F74 16312 bytes
SHA-256: aad9bc0f36eadc3314e08670b59090120051e308b357201f134af3d0b781b2b0