Malicious PDF — malware analysis report

Static analysis result for SHA-256 203ca9a49dfbef79…

MALICIOUS

PDF

80.0 KB Created: 2021-04-15 04:49:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d5b56b04a6724857355f3a8fff8cf1a6 SHA-1: 7298ab738420c260f871d9cf8c8d8af800283272 SHA-256: 203ca9a49dfbef79e03288145f79f1e9559fd50cd8fa1ed6ed8b729fabfb6836
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://lozipotod.ru/strik?utm_term=python+3+download+csv+file+from+url PDF link annotation
    • https://cdn.sqhk.co/zufuxirap/idEifig/dexanitobasokawegomaxusej.pdfIn PDF document text
    • http://purepivuposav.iblogger.org/9723077317.pdfIn PDF document text
    • https://cdn.sqhk.co/dodanadofu/7kiuhjX/govudajaziwokufogel.pdfIn PDF document text
    • https://cdn.sqhk.co/feluxolid/wigF2gd/23915440128.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/8b417bcd-454f-4a5c-8da0-35d7b33264db/shogun_james_clavell_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0daffa7-bfa4-4e60-bb51-813542a0ce40/52939649155.pdfIn PDF document text
    • http://dekegafazuwad.rf.gd/nazotawapekugudon.pdfIn PDF document text
    • https://8cff94d3-ecab-4ea5-ad27-d3e67d02fd32.filesusr.com/ugd/2813e2_894cafb9f1b14258aaf4d0f7ec709de0.pdf?index=trueIn PDF document text
    • https://afa032df-bfad-47da-a9c8-c79260182993.filesusr.com/ugd/6f9b04_b4fcd14291e2447e8d2852df3e8410e8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e509dc60-1901-4774-b47a-707faeb00964/sojabader.pdfIn PDF document text
    • https://s3.amazonaws.com/tumuzu/musurokureximaxoniwup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86178e7f-5a83-4181-8c0e-3d646c3c3c53/veberipojalo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1a90b80-1875-4d63-894c-3f60b43111dc/lexixevepepujozagutaja.pdfIn PDF document text
    • http://pesaforasipu.epizy.com/kayle_guide_mobalytics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5736f6aa-b724-4cd6-bf19-f2b4cc798ed6/8987137502.pdfIn PDF document text
    • https://8c17aa34-c454-4d6c-a218-8929c845e329.filesusr.com/ugd/808cd0_986251b0d1234b64bf4c351c1b154666.pdf?index=trueIn PDF document text
    • https://5a98ae10-8c7e-48da-b83f-9bcbc644cfa3.filesusr.com/ugd/9a8764_7a0c5f1da5504cfbadd60039d504c865.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tufitijinexu/is_rogue_lawyer_part_of_a_series.pdfIn PDF document text
    • https://s3.amazonaws.com/jefobexapulow/what_is_meant_by_pascal_triangle.pdfIn PDF document text
    • https://d3dd75b0-514a-4dbf-a1f7-973a5b421fb1.filesusr.com/ugd/5b46ec_9747ff5bf3ce4916a74cf825a4fb0278.pdf?index=trueIn PDF document text
    • http://mifaropofim.epizy.com/john_deere_x304_dethatcher_attachment.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
    • 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_off0000e398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE398 5680 bytes
SHA-256: 931031d3f0e76322ecd75383e1be3f8de3e3987f4dffa4830e560c92741b3210
font_01_sfnt_off0000f6e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E1 11240 bytes
SHA-256: 8a8707965c1af14e1f38a55f21830c5ea8a7231f2095ddf47480fcca198ca74d
font_02_sfnt_off00011d75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D75 16084 bytes
SHA-256: d21a7fc198e2dbcb9b040cb75dab8cf98619bf1634d79e1d2b6cd60f14bc1e82