Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dcb517e8a1561d0…

MALICIOUS

PDF

41.0 KB Created: 2020-04-02 06:49:49 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: acd241608258c5a759bdef0f35696b3b SHA-1: f6d012a10d8ee17d574a75f0c9c82545d80be044 SHA-256: 0dcb517e8a1561d069b95dc3c4101b32dc6e93640d7262fc48f1d355afda3f45
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, a technique often used for SEO manipulation or to distribute malicious content. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the suspicious linking behavior. While no scripts were directly extracted, the presence of numerous external URLs suggests the document's primary purpose is to redirect users to potentially harmful sites.

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://careaidecommunity.com/uploads/1/3/0/5/130550704/130550704.html#caracteristicas+de+los+estados+liquidos+y+solidos
    • http://newalbanyroof.com/uploads/1/3/0/3/130323602/d1383f91.pdf
    • http://sitesubject.com/uploads/1/3/0/2/130272327/kexesaki-wojizij-dafirinumi.pdf
    • http://roundupforstartups.net/uploads/1/3/0/4/130435722/taremisolor.pdf
    • http://mymikef.com/uploads/1/3/0/2/130272267/wunaf_gipinor_xaginuto_nudadepo.pdf
    • http://highclassshipping.net/uploads/1/3/0/9/130968925/zoladidob.pdf
    • http://anitayorkstories.com/uploads/1/3/0/5/130544754/6205819.pdf
    • http://encounterthespirit.com/uploads/1/3/0/6/130639886/tefutuleka_kifut_nebasijapusuke_dodavapevigi.pdf
    • http://thefoodtruckinvasion.com/uploads/1/3/1/0/131070880/4661302.pdf
    • http://primewebex.net/uploads/1/3/0/3/130324047/vupow-vubaxunifogefe-fomowo.pdf
    • http://beachmedicalservices.com/uploads/1/3/0/6/130621208/6474499.pdf
    • http://nosoaplaundry.com/uploads/1/3/1/3/131380383/4151981.pdf
    • http://bolywoo520.com/uploads/1/3/1/3/131380739/wumuvodaru.pdf
    • http://richestornament.com/uploads/1/3/0/6/130640191/f37c07426026.pdf
    • http://jcashop.com/uploads/1/3/0/7/130739333/5275900.pdf
    • http://blog.neurokinex.org/uploads/1/3/0/9/130969153/dasojutovumu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007627.bin
4d170fac6948cf5947a31425a810088f58b70874db0163fb95bb71c414071396		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7627 9016 bytes

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