Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8bfb3dd38faac72…

MALICIOUS

PDF

43.2 KB Created: 2020-03-29 12:21:32 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e806971ff897d6d6f0fd5d6b378b64e4 SHA-1: 76c97bb546c06e58c50a99ffc94ecf4b9ae0f3e6 SHA-256: b8bfb3dd38faac72ac908d7cd6779fb55a7f8999eacb5ecc023a484e5353ab10
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier also strongly indicated maliciousness. The document body contains text related to processing and storage devices, likely a lure to disguise the malicious intent of distributing numerous external PDF files.

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://kreativekidsworld.com/uploads/1/3/0/8/130874055/130874055.html#dispositivos+de+procesamiento+y+almacenamiento
    • http://jreedfitness.com/uploads/1/3/0/6/130621313/2776137.pdf
    • http://kelseymann.com/uploads/1/3/0/4/130490117/2fa5e432b14.pdf
    • http://aksecommercialservicesllc.com/uploads/1/3/0/3/130379844/1279672.pdf
    • http://zeatechglobal.com/uploads/1/3/0/6/130605159/bibuge.pdf
    • http://thebigjazzshow.com/uploads/1/3/1/4/131411199/dowiwave.pdf
    • http://wigglebottomaussies.com/uploads/1/3/0/5/130589270/2180119.pdf
    • http://therealvictims.com/uploads/1/3/0/8/130814157/1de740ed.pdf
    • http://heartlessonline.com/uploads/1/3/0/6/130639321/guvases-rupugof-gakorar.pdf
    • http://paradymearmor.com/uploads/1/3/0/8/130874292/8080876.pdf
    • http://modernmaternal.com/uploads/1/3/0/6/130639747/wuruxuvelovegu-gimadedup-ruwizoxazu-zivipewi.pdf
    • http://shinzuikai.com/uploads/1/3/0/2/130274322/e19f722.pdf
    • http://birkdale-trophies.com/uploads/1/3/0/6/130604935/kesoza_tatadiduzofor.pdf
    • http://5starcbdoil.info/uploads/1/3/0/6/130622013/2124668.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_off00007e94.bin
6f9c951f5ff47f819593994ae594e6ba9d97fe0a85d6baa6abd1fe63a9ea36ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E94 8520 bytes

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