Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a7cf764001d2182…

MALICIOUS

PDF

38.2 KB Created: 2020-06-08 23:39:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 04d20ae098cc3708baccfa00e47dc91c SHA-1: fca45db2f1cb518f7edafc2e444004934c4a31ee SHA-256: 4a7cf764001d21828f8c1585fda75507f8eedc652067baac9825bc30bae4eb56
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to domains that appear to be part of a link farm designed to host malicious content. The heuristic 'PDF_SEO_LINK_FARM' strongly indicates this malicious intent. The document body, though heavily obfuscated, contains a URL that aligns with the findings of the heuristics, suggesting a coordinated effort to redirect users to potentially harmful websites. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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 http://jehrv.slpny.com/uploads/1/3/0/6/130621959/130621959.html#t%25C3%25BCrkiye+texture+pack PDF link annotation
    • http://dbsmithjr.com/uploads/1/3/0/6/130605143/14a23.pdfIn PDF document text
    • http://m.jekyllhydeapparel.com/uploads/1/3/1/3/131384021/3398693.pdfIn PDF document text
    • http://swetadoshi.com/uploads/1/3/0/6/130605097/3048022.pdfIn PDF document text
    • http://mybodyfitmeals.com/uploads/1/3/1/8/131871622/gegejikasinofevezu.pdfIn PDF document text
    • http://everywatertower.com/uploads/1/3/0/4/130483253/galakori.pdfIn PDF document text
    • http://sbga55.sbgame.net/uploads/1/3/2/3/132303353/f4a0e14d03005.pdfIn PDF document text
    • http://potnuts.me/uploads/1/3/0/8/130814329/f7e9759eb.pdfIn PDF document text
    • http://bellimport.com/uploads/1/3/0/7/130776085/terixivo.pdfIn PDF document text
    • http://tourstotheisleofskye.com/uploads/1/3/0/5/130589009/wirak_sipudalafuz_biniguv_rakojinikafax.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://rarimuvu282494435.files.wordpress.com/2020/06/2458349276.pdfIn PDF document text
    • https://joxaloli.files.wordpress.com/2020/06/wavujotoj.pdfIn PDF document text
    • https://kuvonalu.files.wordpress.com/2020/06/39611194857.pdfIn PDF document text
    • https://dumatogolage.files.wordpress.com/2020/06/16967186839.pdfIn PDF document text
    • https://wiwokovof.files.wordpress.com/2020/06/sidorizivitelomixo.pdfIn PDF document text
    • https://vadobil.files.wordpress.com/2020/06/womaletowakolajepakukulu.pdfIn PDF document text
    • https://jidolujov.files.wordpress.com/2020/06/15497048613.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

Related samples 6

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000050b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x50B9 11448 bytes
SHA-256: 7eb848d1fe67e3705e61ac8f1b6d55a474acd7de3ec87495dcd6416d796fd90c
font_01_sfnt_off0000760d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x760D 16192 bytes
SHA-256: 842dbfc13cb662a4375a8633188c914ce3623165519c1896ff6d5e4e298c3464

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